Counting Forward and Backwards

15, 16, 17, 18, ...

• 18, 19, 20, 21

• 28, 29, 30, 31

• 19, 20, 21, 22

• 8, 9, 10, 11

What number comes after 63?

• 62

• 36

• 63

• 64

What number comes before 21?

• 11

• 23

• 20

• 31

76, 75, 74, 73, ...

• 72, 71, 70, 69

• 74, 75, 76, 77,

• 63, 62, 61, 60,

• 72, 71, 60, 69

26, 27, 28, 29, ___, 31, 32, 33

• 24

• 30

• 29

• 40

99, 100, 101, ___, 103, 104

• 1002

• 102

• 112

• 100

23, 22, 21, 20, ___, 18, 17, 16

• 21

• 30

• 19

• 15

109, 110, 111, ___, 113, 114

• 110

• 1002

• 12

• 112

48, 49, 50, ...

• 51, 52, 53,

• 60, 70, 80,

• 47, 48, 49,

• 15, 16, 17

What number comes after 79?

• 71

• 70

• 78

• 80