Tuesday, Oct 30

5 Minute CheckComplete on your homework. Find each sum1. 4.9 + 3.02. 0.796 + 13Find the difference.3. 19.86 - 4.944. 82 67.185 Minute CheckComplete on your homework. Find each sum1. 4.9 + 3.05 Minute CheckComplete on your homework. Find each sum1. 4.9 + 3.0 4.9 + 3.0 7.95 Minute CheckComplete on your homework. Find each sum2. 0.796 + 135 Minute CheckComplete on your homework. . Find each sum2. 0.796 + 13 13.000 Annex zeros, if needed. + 0.796 13.7965 Minute CheckComplete on your homework. Find the difference.3. 19.86 - 4.945 Minute CheckComplete on your homework. Find the difference.3. 19.86 - 4.94

19.86 - 4.94 14.925 Minute CheckComplete on your homework. Find the difference.4. 82 67.185 Minute CheckComplete on your homework. Find the difference.4. 82 67.18

82.00 Annex zeros - 67.18 14.82FlashcardsComplete in your notebook.

Complete in your notebook.

Complete in your notebook.

Complete in your notebook.

Complete in your notebook.

Complete in your notebook.

Complete in your notebook.

Complete in your notebook.

Complete in your notebook.

Complete in your notebook.

Complete in your notebook.

Thursday, Oct 1Lesson 3.2/3.3

Estimating and Multiplying Decimals by Whole NumbersMultiplying Decimals by Whole NumbersLesson 3.2 is estimation and will be incorporated into lessons 3.3 and 3.4.

Multiplying Decimals by Whole NumbersObjective: To understand how to estimate and find products of decimals and whole numbers.

Multiplying Decimals by Whole NumbersTo multiply a decimal and whole number, multiply as normal and then place the decimal point.

Multiplying Decimals by Whole NumbersFind the product of 6 and .93.

First, round the numbers to the nearest whole number and multiply to get an estimate.

Multiplying Decimals by Whole NumbersFind the product of 6 and .93.

Which is .93 closest to? 0.93 1

Digits from 0 to 4 round down and digits from 5-9 round up.

Multiplying Decimals by Whole NumbersFind the product of 6 and .93.

Which is .93 closest to? 0.93 1

6 x 1 = 6, so6 x .93 6

Multiplying Decimals by Whole NumbersFind the product of 6 and .93.To Multiply Decimals.Step 1 Stack the numbers with the number with the most digits on top.

Multiplying Decimals by Whole NumbersFind the product of 6 and .93.To Multiply Decimals.Step 1 Stack the numbers with the number with the most digits on top. .93 x 6

Decimals points do NOT need to be lined up when multiplying.

Multiplying Decimals by Whole NumbersFind the product of 6 and .93.To Multiply Decimals.Step 2 Multiply the digits without regard to the decimal points.

Multiplying Decimals by Whole NumbersFind the product of 6 and .93.To Multiply Decimals.Step 2 Multiply the digits without regard to the decimal points. .93 x 6 558

Multiplying Decimals by Whole NumbersFind the product of 6 and .93.To Multiply Decimals.Step 3 Determine the number of decimal places in the factors to locate the decimal point in the product.

Multiplying Decimals by Whole NumbersFind the product of 6 and .93.To Multiply Decimals.Step 3 Determine the number of decimal places in the factors to locate the decimal point in the product. .93 2 decimal places x 6 0 decimal places 5.58 2 decimal places

Is this a reasonable answer?

Multiplying Decimals by Whole NumbersFind the product of 4 and .83.

Is this a reasonable answer?

5.58 6

Multiplying Decimals by Whole NumbersFind.5 x 10.2

Estimate?

Multiplying Decimals by Whole NumbersFind.5 x 10.2 50

Estimate?

Step 1 - ?

10Multiplying Decimals by Whole NumbersFind.5 x 10.2 50

10.2 x 5

Step 2 - ?

10Multiplying Decimals by Whole NumbersFind.5 x 10.2 50

10.2 x 5 510

Step 3 - ?

10Multiplying Decimals by Whole NumbersFind.5 x 10.2 50

10.2 1 decimal place x 5 0 decimal place 51.0 1 total decimal place

10Multiplying Decimals by Whole NumbersFind.5 x 10.2 50

10.2 1 decimal place x 5 0 decimal place 51.0 1 total decimal place

Does this seem reasonable?

10Multiplying Decimals by Whole NumbersFind.5 x 10.2 50

10.2 1 decimal place x 5 0 decimal place 51.0 1 total decimal place

Does this seem reasonable? Yes, since 50 51

10Multiplying Decimals by Whole NumbersFind.7 x 7.5

Do this on your own.

Multiplying Decimals by Whole NumbersFind.7 x 7.5

Estimate?

Multiplying Decimals by Whole NumbersFind.7 x 7.5 56

Actual?

8Multiplying Decimals by Whole NumbersFind.7 x 7.5 56

7.5 1 decimal place x 7 0 decimal place 52.5 1 total decimal place

Does this seem reasonable?

8Multiplying Decimals by Whole NumbersFind.7 x 7.5 56

7.5 1 decimal place x 7 0 decimal place 52.5 1 total decimal place

Does this seem reasonable?Yes, since 52.5 56

8Multiplying Decimals by Whole NumbersFind.1.2 x 45

Do this on your own.

Multiplying Decimals by Whole NumbersFind.1.2 x 45

Estimate?

Multiplying Decimals by Whole NumbersFind.1.2 x 45 45

Actual?

1Multiplying Decimals by Whole NumbersFind.1.2 x 45 45

1.2 x 45 60 480 54.0

1This is how your homework should look. You will need to round the decimal, add the , and estimate. You will need to show work and circle answer. Multiplying Decimals by Whole NumbersFind.5 x .02

Do this on your own.

Multiplying Decimals by Whole NumbersFind.5 x .02

Estimate?

Multiplying Decimals by Whole NumbersFind.5 x .02 0

Actual?

0Multiplying Decimals by Whole NumbersFind.5 x .02 0

.02 x 5 0.10

0This is how your homework should look. You will need to round the decimal, add the , and estimate. You will need to show work and circle answer. Multiplying Decimals by Whole NumbersA sheet of printer paper is 8.5 inches by 11 inches. What is the area of the paper? (Hint: area = length x width)

(Do this on your own)

Multiplying Decimals by Whole NumbersA sheet of printer paper is 8.5 inches by 11 inches. What is the area of the paper? (Hint: area = length x width)8.5 x 11 99 8.5 x 11 85 850 93.5

9Multiplying Decimals by Whole NumbersA pack of baseball cards costs $1.20 and you want to buy 5 packs. If you already have $2, how many more dollars do you need?

Do this on your own.

Multiplying Decimals by Whole NumbersA pack of baseball cards costs $1.20 and you want to buy 5 packs. If you already have $2, how many more dollars do you need?

1.2 1 decimal placex 5 6.0 1 decimal place

$6 (5 packs) $2 (you have) = $4

Multiplying Decimals by Whole NumbersA bee hummingbird has a mass of 1.8 grams. How many grams are 6 hummingbirds and a 4 gram nest?

Do this on your own.

Multiplying Decimals by Whole NumbersA bee hummingbird has a mass of 1.8 grams. How many grams are 6 hummingbirds and a 4 gram nest?

1.8 1 decimal place x 6 10.8 1 decimal place + 4. (nest) 14.8 g total

Multiplying Decimals by Whole NumbersFind two different ways to find the value of the expression 5.7 x 1.17 x 100 that do not require you to first multiply 5.7 x 1.17.

Do this on your own.

Multiplying Decimals by Whole NumbersFind two different ways to find the value of the expression 5.7 x 1.17 x 100 that do not require you to first multiply 5.7 x 1.17.

Two possible answers.1.17 x 100 = 117 x 5.4 = 666.95.7 x 100 = 570 x 1.17 = 666.9

Multiplying Decimals by Whole NumbersUse the product of 123 x 47 to find the product of 123 x 0.47. Explain the difference between the two products.

Do this on your own.

Multiplying Decimals by Whole NumbersUse the product of 123 x 47 to find the product of 123 x 0.47. Explain the difference between the two products. 123 123 x 47 x .47 861 8614920 49205781 57.81

The products are different by a factor of 100. Multiplying Decimals by Whole NumbersYour friend thinks that 1.5 x 8 = 1.20 because you do not count the zero when placing the decimal point. Is your friend correct? Explain.

Do this on your own.

Multiplying Decimals by Whole NumbersYour friend thinks that 1.5 x 8 = 1.20 because you do not count the zero when placing the decimal point. Is your friend correct? Explain.

No, you need the zero to place the decimal point.But you can unannex the zero after you place the decimal point.

Multiplying Decimals by Whole NumbersComplete pages 197, #1 8 in your book. Bring to my desk when complete. Agenda NotesHomework Homework Practice 3.3Due Friday, Oct 2Show all work and circle all answers!Mid-Chapter 3 Quiz - Monday, Oct 5