Addition

Addition

Subtraction

Multiplication

Division

Vocabulary

100

x + 4 = 25

What is 21

100

x - 2 = 6

What is 8

100

9x = 27

3

100

y ÷ 6 = 2

12

100

This is a letter that represents an unknown value in an equation.

Variable

200

a + 13 = 10

What is -3

200

d - 7 = 9

16

200

7x = 63

9

200

x ÷ 4 = 14

56

200

This means the opposite.

Inverse

300

n + 8= 14

6

300

k - 83 =121

204

300

5e = 400

80

300

x ÷ 6 = 6

36

300

This is a math sentence this does have an equal sign.

Equation

400

x + 36 = 100

64

400

x - 327 = 665

992

400

11x = 275

25

400

a ÷ 13 = 28

364

400

This is a math sentence that does not have an equal sign.

Expression

500

c + 27= 56

29

500

a - 163 = 200

363

500

21y = 756

36

500

x ÷ 15 = 8

1200

500

These are called __________ in math.

+: Addition

-: Subtraction

x: Multiplication

÷: Division

Operations

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