Addition
Math
Before and After
Subtraction
Missing Number
Skip Counting by 2 and 10
100

15 + 6 =

21
100

18 + 4

22
100

What number comes before 9?

8

100

12 - 9 =

3
100

What is the missing number?

39, 40, 41, ___, 43

42

100

10, 20, 30, 40, ___

50

200

18 + 8 =

26

200

13 + ? = 16

3

200

What number comes before 20? 

19

200

13 - 7 =

6

200

What is the missing number?

7, 8, 9, 10, ___, 12, 13, 14, 15, 16

11

200

2, 4, 6, 8, 10, 12, __

14

300

 14+ 3 =

16

300

16 - ? = 8

8

300

What number comes after 59?

60

300

15 - 10 =

5

300

What is the missing number?

75, 76, ___, 78, 79

77

300

10, 20, __, 40, 50, __

30, 60

400

20 + 10 =

30

400

? - 5 = 18

23

400

What number comes before 78? 

77

400

20 - 16 =

4

400

What is the missing numbers? 

15, __, 17, 18, __, 20, 21, 22, 23, 24

16,19

400

2,__,6, __

4,8

500

25+4=

29

500

 ? - 17 = 22

39

500

What number comes before 83

82

500

20-8 =

12

500

What is the missing number?

74, 75, ___, ___, 78,___,80

76,77,79

500

10, 20, 30, __,50, 60, __, 80, __

40, 70, 90

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