Equations

Multiplying Equations

100

3x=27 

9

200

15x=135

9

300

-161x=644

-4

400

-16x = -36

2.25

500

Mrs. White's class had 5 times as much cans for the food drive than Mrs. McClure's. If Mrs. White's class has 75 cans, then how many does Mrs. McClure's class have? 

15

Dividing Equations

100

x/5 = 6

30

200

x/25 = 63

1,575

300

x/161 = 632

101,752

400

x/-9 = 27

-243

500

x/-90 = -9

810

Adding Equations

100

x + 9 = 25

16

200

x + 18.1 = 19.3

1.2

300

x + 9.7 = 18

8.3

400

x + 4 = -9

-13

500

What does the inverse operation mean?

Opposite Operation

Subtracting Equations

100

x - 15 = 98

113

200

x - 19.1 = 99.90

119

300

x - 67.15 = 98

165.15

400

x - 19 = -81

-62

500

x - 19.8 = -51.2

-31.4

Writing Equations

100

Jessica and Jamie scored 42 points altogether. Jamie scored 23 more points than Jessica. Write an equation to solve how much Jessica scored. 

x + 23 = 42

200

There were 89 fewer students at the pep rally than at the football game. There were 200 students at the pep rally. Write an equation to figure out how many students attended the football game?  

x - 89 = 200

300

Kathi spent $2.75 on coffee each time she went. If she spent $195, write an equation to tell how many times she went to get coffee.

2.75x=195

400

Carol put her students into group of seven. If each group has 9 people in them, write an equation on how to figure out how many people are in the class. Also solve the equation.

x/7 = 9 , x = 63

500

An equilateral triangle has side lengths of 2x. The perimeter of the triangle is 42. Write an equation and SOLVE to figure out what each length of the triangle is.

6x=42, each side length is 14