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Course 1 • Chapter 7 Equations 103

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Lesson 1 Homework PracticeEquations

Identify the solution of each equation from the list given.

1. h + 9 = 21; 10, 11, 12 2. 34 + p = 52; 18, 19, 20 3. 45 - k = 27; 17, 18, 19

4. y - 13 = 24; 37, 38, 39 5. 28 = r - 12; 40, 41, 42 6. 56 = 7q; 7, 8, 9

7. 9w = 45; 3, 4, 5 8. 30 ÷ w = 5; 4, 5, 6 9. t ÷ 6 = 9; 52, 53, 54

Solve each equation mentally.

10. a + 6 = 11 11. 7 + n = 18 12. 17 = 9 + e

13. 24 = 34 - j 14. k - 12 = 4 15. 25 - c = 15

16. 9b = 36 17. 11w = 66 18. 80 = 10d

19. 45 ÷ m = 5 20. g ÷ 4 = 12 21. 26 ÷ k = 2

22. ANIMALS A whiptail lizard has a tail that is twice as long as its body. The equation 2b = 6 describes the length of a certain whiptail lizard’s tail in inches. If b is the length of the whiptail lizard’s body, use mental math or the guess, check, and revise strategy to find the length of this whiptail lizard’s body. What is the total length of the lizard?

23. SPORTS CAMP There are 475 campers returning to sports camp this year. Last year, 525 campers attended sports camp. The equation 475 = 525 - c shows the decrease in the number of campers returning to camp from one year to the next. Use mental math or the guess, check, and revise strategy to find the number of campers who did not return to camp this year.

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use.Lesson 1 Skills PracticeEquations


1. s + 12 = 17; 5, 6, 7 2. 54 + f = 70; 16, 17, 18

3. 69 = 50 + s; 17, 18, 19 4. 47 = 77 ! b; 20, 30, 40

5. 44 = t ! 10; 52, 53, 54 6. 25 ! k = 20; 5, 6, 7

7. 4r = 40; 8, 9, 10 8. 33 = 11d; 3, 4, 5

9. 6g = 36; 5, 6, 7 10. 28 ÷ w = 7; 3, 4, 5

11. b ÷ 6 = 4; 22, 23, 24 12. 56 ÷ c = 8; 6, 7, 8


13. 4 + k = 11 14. 7 + f = 15 15. z + 16 = 25

16. j + 15 = 30 17. 20 = 30 ! n 18. 34 = r ! 10

19. 23 ! m = 10 20. p ! 4 =13 21. 8w = 80

22. 7q = 21 23. 48 = 6g 24. 54 = 9m

25. 18 ÷ t = 6 26. y ÷ 3 = 5 27. h ÷ 12 = 1

28. FLOWERS Mickaela picked flowers for her shop. She picked 12 dozen flowers in the morning. By the end of the day, she had picked 18 dozen flowers. Use mental math or the guess, check, and revise strategy to solve the equation 12 + d = 18, and find d, the number of dozen of flowers picked during the rest of the day.

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Course 1 • Chapter 7 Equations

NAME _________________________________________ DATE ____________ PERIOD _______ Lesson 1 Extra Practice

Equations


1. 7 + a = 10; 3, 13, 17 3 2. 14 + m = 24; 7, 10, 34 10

3. 20 = 24 - n; 2, 3, 4 4 4. x + 4 = 19; 14, 15, 16 15 5. 23 ! p = 7; 16, 17, 18 16 6. 11 = w + 6; 3, 4, 5 5

7. 73 + m = 100; 26, 27, 28 27 8. 44 + s = 63; 17, 18, 19 19


9. b + 7 = 12 5 10. s + 10 = 23 13 11. b ! 3 = 12 15 12. d + 7 = 19 12 13. 23 ! q = 9 14 14. 21 + p = 45 24 15. 17 = 23 ! t 6 16. g ! 13 = 5 18 17. 14 ! m = 6 8 18. x ! 3 = 11 14 19. 16 = h + 9 7 20. 50 + z = 90 40


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use.Lesson 1 Problem-Solving PracticeEquations

INSECTS For Exercises 1–3, use the table that gives the average lengths of several unusual insects in centimeters. Use mental math or the guess, check, and revise strategy.

Insect Length (cm) Insect Length (cm)Walking stick 15 Giant water bug 6Goliath beetle 15 Katydid 5Giant weta 10 Silkworm moth 4Harlequin beetle 7 Flower mantis 3

1. The equation 15 - x = 12 gives the difference in length between a walking stick and one other insect. If x is the other insect, which insect is it?

2. The equation 7 + y = 13 gives the length of a harlequin beetle and one other insect. If y is the other insect, which insect makes the equation a true sentence?

3. Bradley found a silkworm moth that was 2 centimeters longer than average. The equation m - 4 = 2 represents this situation. Find the length of the silkworm moth that Bradley found.

4. BUTTERFLIES A Monarch butterfly flies about 80 miles per day. So far it has flown 60 miles. In the equation 80 - m = 60, m represents the number of miles it has yet to fly that day. Find the solution to the equation.

5. CICADAS The nymphs of some cicada can live among tree roots for 17 years before they develop into adults. One nymph developed into an adult after only 13 years. The equation 17 - x = 13 describes the number of years less than 17 that it lived as a nymph. Find the value of x in the equation to tell how many years less than 17 years it lived as a nymph.

6. BEETLES A harlequin beetle lays eggs in trees. She can lay up to 20 eggs over 2 or 3 days. After the first day, the beetle has laid 9 eggs. Solve the equation 9 + e = 20 to find e, the number of eggs she will lay during the second and third days.

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16 Course 1 • Equations

Equation ChainsIn an equation chain, you use the solution of one equation to help you find the solution of the next equation in the chain. The last equation in the chain is used to check that you have solved the entire chain correctly.

Complete each equation chain.

1. 5 + a = 12, so a = . 2. 9f = 36, so f = .

ab = 14, so b = . g = 13 - f, so g = .

16 ÷ b = c, so c = . 63 ÷ g = h, so h = .

14 - d = c, so d = . h + i = 18, so i = .

e ÷ d = 3, so e = . j - i = 9, so j = .

a + e = 25 ! Check: j ÷ f = 5 ! Check:

3. m ÷ 4 = 8, so m = . 4. 18 = v - 12, so v = .

m - n = 12, so n = . v ÷ w = 3, so w = .

np = 100, so p = . 80 = wx, so x = .

q = 40 + p, so q = . w + x = 2y, so y = .

p + q - 10 = r, so r = . xy - z = 40, so z = .

r - m = 8 ! Check: z - v = 2 ! Check:

5. CHALLENGE Create your own equation chain using these numbers for the variables: a = 10, b = 6, c = 18, and d = 3.

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Lesson 2 Homework PracticeSolve and Write Addition Equations

Solve each equation. Check your solution.

1. 9 + b = 14 2. 7 + g = 14 3. t + 4 = 12

4. r + 9 = 16 5. 18 = r + 8 6. 16 = 11 + f

7. t + 1.2 = 3.4 8. 1.9 + y = 4.8 9. 7.8 = 3.5 + a

10. 1 ! 4 + b = 3 !

4 11. w + 2 !

7 = 5 !!

14 12. 2 !

5 = 2 !!

10 + k

13. ALGEBRA What is the value of n if 15 + n = 27?

RETAIL STORES The table shows the monthly earnings of some of the retail stores in a city. Use the table to answer Exercises 14 and 15.

14. Sunny Spot’s earnings were $8,329 more than that of Silver Sky. Write and solve an addition equation to find Silver Sky’s earnings.

15. Write and solve an addition equation to find Huntley’s Creek’s earnings if the total monthly earnings for all the stores is $354,386.

MONTHLY RETAIL EARNINGSStore Earnings

Sunny Spot $52,800Griffin’s Web $43,757Kaylee’s Magic $121,113Gift’s Galore $57,532Silver SkyHuntley’s Creek


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use.Lesson 2 Skills PracticeSolve and Write Addition Equations


1. x + 4 = 7 2. t + 6 = 10

3. y + 3 = 7 4. z + 4 = 6

5. p + 2 = 8 6. b + 6 = 7

7. 6 + a = 8 8. 5 + r = 10

9. 2 + h = 10 10. 6 + y = 9

11. 4 = 2 + v 12. 8 = 7 + w

13. 9 = 3 + r 14. 8 = 5 + q

15. 10 = t + 1 16. 10 = q + 4

17. 5 = a + 0 18. 6 = b + 3

19. PROJECT Zaira spent 55 hours in 2 weeks working on a science project. She worked 32 hours the first week. Write and solve an addition equation to find the amount of time she spent working the second week.

20. BANK ACCOUNTS Keshav has $250 in his account. This is $75 more than his brother Nalin has in his account. Write and solve an addition equation to find the amount of money in Nalin’s account.


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Solve and Write Addition Equations


1. x + 4 = 14 10 2. b + 10 = 15 5 3. 2 + w = 5 3

4. k + 3 = 7 4 5. 6 = 4 + h 2 6. 7 + d = 11 4

7. 9 + m = 11 2 8. f + 9 = 19 10 9. p + 22 = 66 44

10. 34 + t = 41 7 11. 56 = l + 24 32 12. 29 + a = 54 25 13. 17 + m = 33 16 14. b + 34 = 44 10 15. w + 39 = 55 16 16. 6 + a = 13 7 17. 35 = x + 10 25 18. w + 9 = 12 3 19. 8 = p + 7 1 20. 4 + c = 9 5 21. y + 8 = 11 3 22. 16 = t + 5 11 23. c + 6 = 14 8 24. 9 = h + 5 4


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use.Lesson 2 Problem-Solving PracticeSolve and Write Addition Equations

For Exercises 1–3, use the table of waterslide lengths.

Lengths of Waterslides (ft)The Cobra 63Sea Snake 52Slime SlipWater Whip 75Wave Maker 104

1. The Water Whip is 7 feet longer than the Slime Slip. Write and solve an addition equation to find the length of the Slime Slip.

2. If a certain slide was 12 feet longer, it would be the same length as the Water Whip. Write and solve an addition equation to find the name of this waterslide.

3. A new slide that is still under construction will be 156 feet long. This is the same length as two of the existing slides put together. One of the slides is the Sea Snake. Write and solve an addition equation to find the name of the other water slide.

4. STUNT FLYER A stunt airplane is flying at 150 feet. It ascends to 325 feet. Write and solve an equation to find the change in altitude of the airplane.

5. SAVINGS Cornelius is saving money to buy a jacket that costs $47. He has already saved $25. Write and solve an equation to find how much more money Cornelius needs to save.

6. RECYCLING Bonnie has 27 more cans than Jackie. If she has 56 cans, write and solve an equation to find how many cans Jackie has.


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National Monument Solve the addition equations. Then at the bottom of the page, put the letters of the answers in order to complete the name of a monument.

1. 57 + x = 112 2. 119 + x = 164 3. x + 287 = 361

U 55 M 43 I 126

X 56 N 45 J 84

Y 145 0 53 K 74

Z 169 P 55 L 26

4. 70.32 + x = 140.32 5. x + 35.3 = 264.6 6. 1 ! 4 + x = 3 !

8

M 30.32 P 299.9 T 1 ! 2

N 70 M 239.3 U 3 ! 8

O 170 N 235.3 V 1 ! 4

P 210.64 O 229.3 W 1 ! 8

7. x + 3 ! 5 = 11 !

15

K 1 1 ! 3

L 20 ! 15

N 2 ! 15

Tomb of the Soldier








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Lesson 3 Homework PracticeSolve and Write Subtraction Equations


1. h - 5 = 4 2. x - 2 = 5 3. g - 6 = 2

4. 6 = c - 5 5. t - 7 = 19 6. 5 = j - 8

7. y - 1.2 = 4.8 8. a - 3.2 = 5.5 9. 6.6 = w - 1.2

10. d - 1 !! 12

= 5 !! 12

11. m - 3 !! 18

= 11 !! 18

12. b - 3 !! 15

= 1

13. PARASAILING A parasailor is attached by a cable to a boat and towed so that the parachute she is wearing catches air and raises her into the air. When the boat slows down to turn back toward the beach, the parasailor’s chute catches less air and dips 25 meters. She must descend another 45 meters to return to the boat. Write and solve a subtraction equation to find her original height above the boat before the turn.

14. ALGEBRA What is the value of k if 16 = k - 9?

15. PARKS The Petrified Forest National Park in Arizona recently expanded their boundaries by 93,533 acres. The original acreage was 125,000. Write and solve a subtraction equation to find the new acreage of the park.

16. AREA The total land area of the United States is about 3,483,511 square miles more than the total land area of Tennessee, which is about 53,927 square miles. Write and solve an equation to find the total land area of the United States.


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use.Lesson 3 Skills PracticeSolve and Write Subtraction Equations


1. a - 1 = 7 2. b - 2 = 1

3. 3 = c - 1 4. x - 3 = 1

5. 3 = y - 4 6. 2 = k - 4

7. m - 5 = 6 8. n - 3 = 6

9. 1 = s - 8 10. t - 9 = 1

11. v - 9 = 5 12. 6 = v - 7

13. 3 = g - 6 14. 3 = h - 8

15. 5 = z - 7 16. z - 3 = 7

17. 5 = f - 1 18. 1 = d - 2

19. ROCKETS During a test flight, Jeri’s rocket reached a height of 18 yards. This was 7 yards less than the height of Devon’s rocket. Write and solve a subtraction equation to find the height of Devon’s rocket.

20. TADPOLES For two days in a row, Winston rescued tadpoles from a puddle. He rescued 54 on Friday. This is 17 less than the number he rescued on Saturday. Write and solve a subtraction equation to find how many tadpoles he rescued on Saturday.


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Solve and Write Subtraction Equations


1. y ! 7 = 2 9 2. a ! 10 = 22 32 3. g ! 1 = 9 10

4. c ! 8 = 5 13 5. z ! 2 = 7 9 6. n ! 1 = 87 88

7. j ! 15 = 22 37 8. x ! 12 = 45 57 9. k ! 2 = 8 10

10. q ! 16 = 31 47 11. q ! 6 = 12 18 12. j ! 18 = 3 21 13. 5 = g ! 3 8 14. y ! 2 = 6 8 15. 8 = m ! 3 11 16. 2 = x ! 5 7 17. 11 = t ! 5 16 18. c ! 4 = 8 12 19. 18 = q ! 7 25 20. r ! 2 = 5 7 21. 1 = x ! 9 10 22. q ! 10 = 4 14 23. 60 = d ! 4 64 24. s ! 7 = 21 28


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use.Lesson 3 Problem-Solving PracticeSolve and Write Subtraction Equations

For Exercises 1–3, use the article about Florida middle school students breaking a world record.

1. The old record mentioned took place in 2004. Write and solve a subtraction equation to find which year this record-breaking event took place.

2. Write and solve a subtraction equation to find this new record number of students.

3. If a future record has a difference of 50,000 students from this record, what subtraction equation could be used to find it? Use it to find the new record.

4. MARBLES Virginia’s mother gave her marbles for her birthday. Virginia lost 13 of them. If she has 24 marbles left, write and solve an equation to find how many her mother gave her.

5. MONEY Claudio went for a walk. While he was walking, $1.35 fell out of his pocket. When he returned home, he counted his money and had $2.55 left. Write and solve an equation to find how much money was in Claudio’s pocket when he started his walk.

6. HANG GLIDING Aida was hang gliding. After losing 35 feet in altitude, she was gliding at 125 feet. Write and solve an equation to find her height when she started hang gliding.


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Clock ArithmeticDid you realize that, when you work with elapsed time, you use a special kind of arithmetic that is called clock arithmetic? In clock arithmetic, you use the symbols ! for addition and " for subtraction. Here are two examples.

8 o’clock plus 5 hours is 1 o’clock. 4 o’clock minus 7 hours is 9 o’clock. 8 ! 5 = 1 4 " 7 = 9

Add or subtract using the 12-hour clock above.

1. 11 ! 3 2. 7 ! 9 3. 3 " 10 4. 7 " 8

5. 2 ! 12 6. 2 " 12 7. 4 ! 6 8. 9 " 4

To solve “clock equations” involving the 12-hour clock, use inverse operations.

d ! 5 = 2 j " 4 = 10

d ! 5 " 5 = 2 " 5 j " 4 ! 4 = 10 ! 4

d = 9 j = 2

Solve each equation using the 12-hour clocks above.

9. r ! 7 = 5 10. x " 9 = 11 11. b ! 6 = 7

12. t " 12 = 4 13. n " 4 = 3 14. y ! 6 = 1

CHALLENGE In clock arithmetic, you often work with clocks that have different numbers of hours. For example, the clock shown at the right is an 8-hour clock.

Solve each equation using the 8-hour clock at the right.

15. m ! 5 = 2 16. z " 4 = 7 17. p ! 8 = 1

18. c " 8 = 6 19. w " 4 = 8 20. k ! 6 = 3








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Homework PracticeProblem-Solving Investigation: Guess, Check, and Revise

Mixed Problem Solving

Use the guess, check, and revise strategy to solve Exercises 1 and 2.

1. MOVIES Tickets for the movies are $7 for adults and $4 for children. Fourteen people paid a total of $68 for tickets. How many were adults and how many were children?

2. AGES Mei’s mother is 4 times as old as Mei. Mei’s grandmother is twice as old as Mei’s mother. The sum of the three ages is 117. How old are Mei, her mother, and her grandmother?

Use any strategy to solve Exercises 3–6.

3. SWIMMING Fuad is preparing for a swim meet. The table shows the number of laps he swam in the first four days of practice. If the pattern continues, how many laps will Fuad swim on Friday?

Day Mon. Tues. Wed. Thurs. Fri.Laps 1 3 7 15

4. ORDER OF OPERATIONS Use the symbols +, -, !, and ÷ to make the following math sentence true. Write each symbol only once.

8 ____ 2 ____ 1 ____ 3 ____ 4 = 5

5. PATTERNS Draw the next figure in the pattern.

6. MONEY Gary has $1.56 in change in his pocket. If there is a total of 19 coins, how many quarters, dimes, nickels, and pennies does he have?

- ! + =


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use. Skills PracticeProblem-Solving Investigation: Guess, Check, and Revise

Use the guess, check, and revise strategy to solve each problem.

1. MONEY Keegan has 10 coins in his pocket that total $2.05. He only has quarters and dimes. How many of each coin does Keegan have?

2. NUMBERS Ms. Junkin told her students that she was thinking of three different numbers between 1 and 9 that had a sum of 19. Find three possible numbers.

3. SHOPPING Natasha bought some bracelets and some rings during a jewelry store sale. Each bracelet cost $4 and each ring cost $7. If Natasha spent $29 on the jewelry, how many bracelets and rings did she buy?

4. ORDER OF OPERATIONS Use each of the symbols + , -, and ! to make the following math sentence true.

5 ___ 2 ___ 6 ___ 9 = 13


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use. Problem-Solving PracticeProblem-Solving Investigation: Guess, Check, and Revise

1. AGES The sum of Cooper’s, Dante’s, and Carla’s ages is 31. Dante is twice as old as Cooper. Carla is one year older than Dante. How old are Cooper, Dante, and Carla?

2. ELEVATION The table shows the highest point of elevation for 5 different states. How much higher is the highest point of elevation in Colorado than Georgia?

State Highest Point of Elevation (feet)

Arizona 12,633Colorado 14,433Georgia 4,784North Carolina 6,684Texas 8,749

3. FOOTBALL The junior varsity football team scored 23 points in last Saturday’s game. They scored a combination of 7-point touchdowns and 3-point field goals. How many touchdowns and how many field goals did they score?

4. MONEY Willow purchased a new car. Her loan, including interest, is $12,720. How much are her monthly payments if she has 60 monthly payments to make?

5. PATTERNS Draw the next figure in the pattern.

6. FUNDRAISER The school band is having a car wash to raise money. Their goal is to collect $150. So far they have earned $10 each from three families and $5 each from 15 families. How much more money do they have to earn to reach their goal?


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Lesson 4 Homework PracticeSolve and Write Multiplication Equations


1. 7a = 63 2. 14k = 0 3. 13w = 39 4. 55 = 11x

5. 3v = 42 6. 96 = 12f 7. 14u = 70 8. 3c = 3

9. 15s = 120 10. 35q = 5 11. 5 ! 6 k = 1 !

6 12. 1 2 !

3 j = 15

13. 72 = 0.6r 14. 0.8b = 1.12 15. 2.3g = 7.13 16. 40 = 1.6m

17. TIME The Russian ice breaker Yamal can move forward through 2.3-meter-thick ice at a speed of 5.5 kilometers per hour. Write and solve a multiplication equation to find the number of hours it will take to travel 82.5 kilometers through the ice.

FUNDRAISING A school is raising money by selling calendars for $20 each. Mrs. Hawkins promised a party to whichever of her English classes sold the most calendars over the course of four weeks. Use the table to answer Exercises 18–20.

18. Write and solve an equation to show the average number of calendars her 3rd period class sold per week during the four-week challenge.

19. How many calendars did the 1st and 2nd period classes sell on average per week? Write and solve a multiplication equation.

20. What was the average number of calendars sold in a week by all of her classes?

Mrs. Hawkins’ Fundraising Challenge

Class Number of Calendars Sold

1st Period 602nd Period 1233rd Period 894th Period 126


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use.Lesson 4 Skills PracticeSolve and Write Multiplication Equations


1. 3a = 9 2. 7b = 14

3. 9c = 36 4. 8c = 16

5. 3x = 18 6. 7n = 7

7. 10g = 20 8. 3k = 15

9. 4h = 32 10. 27 = 9h

11. 24 = 12j 12. 28 = 7y

13. 36 = 9y 14. 40 = 0.5r

15. 5 = 1 ! 5 w 16. 50 = 5p

17. 0.25f = 10 18. 3 ! 4 = 1 !

4 w

19. CAT FOOD A grocery store is selling 6 cans of cat food for $3. Write and solve a multiplication equation to find the cost of a can of cat food.

20. DEPOSITS Earline has put $250 into her savings account. To do this, she made 10 deposits of the same amount. Write and solve a multiplication equation to find the amount of each deposit.


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Solve and Write Multiplication Equations


1. 5x = 30 6 2. 2w = 18 9 3. 2a = 7 3.5

4. 2d = 28 14 5. 3c = 6 2 6. 11n = 77 7

7. 3z = 15 5 8. 9y = 63 7 9. 6m = 54 9

10. 5f = 75 15 11. 20p = 5 0.25 12. 4x = 16 4 13. 4t = 24 6 14. 7b = 21 3 15. 19h = 0 0 16. 22d = 66 3 17. 3m = 78 26 18. 8x = 2 0.25


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use.Lesson 4 Problem-Solving PracticeSolve and Write Multiplication Equations

For Exercises 1–3, use the table below. The table shows the amount ofeach kind of marine life in Bunito’s saltwater aquarium.

Bunito’s Saltwater Aquarium

Clown fish

Sea urchins

Seahorses 16

Starfish 9

1. The number of starfish is 3 times the number of clown fish. Write and solve an equation to find how many clown fish are in the aquarium.

2. The number of seahorses is 4 times the number of sea urchins. Write and solve an equation to find how many sea urchins are in the aquarium.

3. The total cost of the starfish was $7.20. Write and solve an equation to find how much one starfish cost.

4. MONEY Paz has $18 in her wallet. This is 3 times the money in her pocket. Write and solve an equation to find how much money Paz has in her pocket.

5. PAGES Marquis read 230 pages of a novel in 5 hours. Write and solve an equation to find how many pages he read in one hour.

6. EXPRESS An express delivery company charges by the pound. A package that weighed 5 pounds cost $24.50 to overnight. Write and solve an equation to find how much the delivery company would charge to overnight a package that weighed 1 pound.


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Course 1 • Equations 39

Enrich

Patterns in EquationsOn this page, you will explore patterns of change in equations.

For each table:

a. Describe how the equation changes from row to row.b. Complete the Solution column.c. Describe how the solution changes from row to row.

1. Equation Solution

t + 3 = 8

t + 3 = 7

t + 3 = 6

t + 3 = 5


3x = 9

3x = 6

3x = 3

3x = 0


r - 3 = 3

r - 3 = 2

r - 3 = 1

r - 3 = 0


m + 0.8 = 7

m + 0.7 = 7

m + 0.6 = 7

m + 0.5 = 7


1 ! 5 j = 5

1 ! 5 j = 4

1 ! 5 j = 3

1 ! 5 j = 2


1 ! 4 c = 1

1 ! 3 c = 1

1 ! 2 c = 1

1 ! 1 c = 1







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Lesson 5 Homework PracticeSolve and Write Division Equations


1. 5 = r ! 7 2. 6 =

j !

8 3. 7 = k !

7

4. p !

4 = 12 5. h !!

6 = 8 6. s !

7 = 12

7. 11 = r !! 13

8. 14 = a !! 30

9. 12 = q !!

14

10. p !!

15 = 9 11.

y !!

17 = 10 12. b !!

12 = 15

13. 4.7 = r ! 5 14. 0.3 = d !!

11 15. 1.9 = r !!

0.3

16. b !! 15

= 0.9 17. 1.4 = c !! 1.4

18. 5.3 = d !! 9.2

Write and solve a division equation.

19. POTTERY Dr. Anthro has a piece of Roman pottery that is 954 years old. This is one third as old as a piece of his Grecian pottery. How old is his piece of Grecian pottery?

20. BREAD Mrs. Dinh is dividing a loaf of bread into equal sections for herself, her husband, and their four children. If each person’s serving has 210 Calories, how many Calories are in the loaf?


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use.Lesson 5 Skills PracticeSolve and Write Division Equations


1. 4 = r ! 2 2. 6 =

j !

2 3. 7 = k !

2

4. p !

4 = 9 5. h !!

4 = 8 6. s !

5 = 6

7. 10 = r ! 5 8. 11 = a !

3 9. 12 =

q !

4

10. p !

5 = 9 11.

y !

7 = 10 12. b !!

12 = 10

13. 12 = r ! 5 14. 11 = d !!

11 15. 9 = r !!

13

16. b !! 15

= 2.5 17. 2.2 = c !! 14

18. 0.5 = d !! 10

Write and solve a division equation.

19. LAWN MOWING Ali was paid $75 for mowing a neighbor’s yard. This is one fourth of the amount of money she earned all summer. How much did Ali earn all summer?

20. POOL The width of a swimming pool is one third of its length. The width of the pool is 15 feet. What is the length of the pool?


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Solve and Write Division Equations


1. 6 = t3 18 2. 11 = a5 55 3. 7 = r4 28

4. 1 = g10 10 5. 12 = w

12 144 6. 5 = m4 20

7. k3 = 7 21 8.

p12 = 10 120 9.

v9 = 2 18

10. h6 = 9 54 11.

s4 = 4 16 12.

x8 = 7 56

13. c9 = 8 72 14.

p5 = 7 35 15.

k5 = 4 20

16. y

33 = 3 99 17. z6 = 1.5 9 18.

m6 = 7 42


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use.Lesson 5 Problem-Solving PracticeSolve and Write Division Equations

GOLF For Exercises 1–3, use the table below. The table shows the pricelist of golf balls.

Price List of Golf Balls

Brand Dozen 3-Pack

Spinners $10 $3

Fly-Boys ? $4

Max Flight $12 ?

1. The cost of a dozen Spinners is one sixth the amount of money Ibon brought to the golf course. Write and solve a division equation to find the amount of money Ibon brought to the golf course.

2. The price of a 3-pack of Spinners is one third the price of a dozen Fly-Boys. Write and solve a division equation to find the price of a dozen Fly-Boys.

3. Three golfers decide to split the cost of a 3-pack of Max Flight. Each golfer’s cost is $1.50. Write and solve a division equation to find the price of a 3-pack of Max Flight.

4. GIFT CERTIFICATE At the end of a soccer season, four families decide to buy the coach a gift certificate to a sporting goods store. Each family contributes $35 towards the gift certificate. Write and solve a division equation to find how much the gift certificate is worth.

5. DISTANCE Shawna noticed that the distance from her house to the ocean, which is 40 miles, was one fifth the distance from her house to the mountains. Write and solve a division equation to find the distance from Shawna’s house to the mountains.

6. DOG FOOD A bag of Super Dog dog food, at $12.85, is one third the price of a bag of Power Dog dog food. Write and solve a division equation to find the price of a bag of Power Dog dog food.


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Course 1 • Equations 45

Enrich

Making Sums from Division Equations Find the solution of each equation. Then place the solutions in the circles so that the sum of the numbers in any straight line is the same.

1. a ! 2 = 13 2. t !

2 = 17 3. k !

9 = 3

4. w ! 11

= 3 5. c ! 1.4

= 20 6. 0.4 = y !

80

7. 1 = f !

29 8. 310 =

q !

0.1 9. 600 =

p !

0.05






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