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Addition Equations
Subtraction Equations
Mixed Equations
100

What's the missing number?

____ + 6 = 12

6

100

15 - 7 = ___

8

100

19 = 10 + ___

9

200

What's the missing number?

3 + ____ = 13

10

200

___ - 3 = 16

19

200

11 + __ = 15

4

300

What's the missing number?

____ + 50 = 70

20

300

___ - 3 = 10

13

300

___ - 9 = 25

34
400

What's the missing number?

_____ + 33 = 40

7

400

27 - 6 = ___

21

400

___ - 9 = 6

15

500

What's the missing number? 

15 + ____ = 25

10

500

20 - ____ = 2

18

500

____ + 11 = 20

9