©evergreen public schools 2010 1 solve equations with variables on one side teacher notes still use...

©Evergreen Public Schools 2010

1

Solve Equations with Variables on One Side

Teacher Notes

Still use algebra tiles!Still use algebra tiles!Students write and solve equations from word problems. . Supplies Each student needs a bag of algebra tiles.

7/14/11


2

Target 3a I can write an equation to solve a problem.

What do you think this means?

Can you give an example?


3

LaunchLaunchLaunchLaunchSolve. Remember from last year. • 3x = 6

• 2x + 1 = 7

Be prepared to share your

work…

Be prepared to share your

work…


4


5

The left side of an equation is equal to the right side.


6



7


25¢ 25¢ =


8

Get a piece of blank paper

• Fold it in half hamburger style.• Use the fold to divide the 2 sides of

the equation.


9

Use Algebra Tiles to Solve

Cindy, my sister, read two more books than me. She read 5 books. How many did I read?

What are you asked to find?Define x: Write an equation to solve

the problem.


10

Cindy, my sister, read two more books than me. She read 5 books.

How many did I read?

Books I read. Books Cindy read.


11



Keep it balanced.Do exactly the same to both sides of the equation.



12

What did I just do?Did I keep it balanced?





13What is the solution?

I read 3 books.





14

I used 3 one-dollar bills when I bought lunch. After lunch, I had 1 one-dollar left in my wallet. How many one-dollar bills did I have before lunch?

What are you asked to find?Define x: Write an equation to solve the

problem.



15

I used 3 one-dollar bills when I bought lunch. After lunch, I had 1 one-dollar left in my wallet.

How many one-dollar bills did I have before lunch?

How can I get x alone and still keep the equation balanced?

Remove zero pairs

Remove zero pairs

Before lunch

After lunch


16

I had $4 before lunch.

I used 3 one-dollar bills when I bought lunch. After lunch, I had 1 one-dollar left in my wallet.

How many one-dollar bills did I have before lunch?

Before lunch

After lunch


17

Check it: x = 4 x + (-3) = 1

1 1 =

:-)


18

John has 4 video games. He has a goal to buy 3 each month until he has 10 games. How many months does he need to buy games to reach his goal?

What are you asked to find?Define x: Write an equation to solve the problem.



19

John has 4 video games. He has a goal to buy 3 each month until he has 10 games. How many months does he need to buy games to reach his

goal?John’s Games

John’s Goal


20


goal?John’s Games

John’s Goal


21


goal?John’s Games

John’s Goal


22


goal?John’s Games

John’s Goal


23

How can we solve for 1x?


goal?John’s Games

John’s Goal


24


goal?John’s Games

John’s Goal


25


goal?John’s Games

John’s Goal


26

John buys games for 2 months.

=


goal?John’s Games

John’s Goal


27

Check it: x = 23x + 4 = 10

10 10=

:-)


28

Debrief

Write what you know about using algebra tiles to solve a problem.


29

5

3

12

4

Did you hit the target?Target 3a I can write an

equation to solve a problem.

Rate your understanding of the target from 1 to 5.

5 is a bullseye!


30

PracticePractice

Practice 2.5____


31

Ticket Out

Solve with algebra tiles.Lizzy bought 4 pens with a $10 bill and

got $2 in change. What was the average she spent on each pen?

What are you asked to find?Define x: Write an equation to solve the problem.

©evergreen public schools 2010 1 solve equations with variables on one side teacher notes still use...

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