Missing Number

Front

68, ___, 80, 86

Back

74

Front

65, 71, ____, 83

Back

77

Front

60, 66, 72, ____

Back

78

Front

50, 60, 70, ___

Back

80

Front

37, ___, 47, 52

Back

42

Front

What is the next number in the sequence: 10, 20, ___?

Back

30

Front

What is the missing number: 5, 10, ___, 20?

Back

15

Front

Fill in the blank: 1, 2, 3, ___, 5.

Back

4

Front

What comes after 15 in this pattern: 10, 12, 14, ___?

Back

16

Front

What is the missing number: 30, ___, 50, 60?

Back

40