Addition
Subtraction
Vocabulary
Multiplication
Division
100

3 + a = 8

a = 5

100

a - 5 = 4

9

100
What's the inverse operation of subtraction?
Addition
100

5a = 25

5

100

a/9 =9


81

200

8 + a = 12

a = 4

200

a - 10 = 13

23

200

In an equation, what are you trying to do to the variable? 

Isolate the variable/ get it by itself

200

25 x a = 625

25

200


a/7=4

28

300

21 + a = 26

5

300

 a-10 = 8

18
300


True or False: If you add 3 to one side of an equation, you don't need to add it to the other side.

FALSE!

300

18a = 486

27

300

a/10=4

40

400

a + 20 = 30

10

400

 a - 15= 15

30

400

What is the inverse of addition?

subtraction

400

17 x a = 34

2

400

k ÷ 3 = 11

33
500

a + 52 = 106

54

500

a - 248 = 700

948

500

What is the inverse of division?

multiplication

500

-8a = -24

500

a ÷ 50 = 100

5,000

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