Use a Rule
Missing Number
Name the Rule
100

The first number is 15. The rule is to subtract 3. What is the next number in the sequence?

15, ____, 

12

100

60,    65,    70,    75,    80, ____,  90

85

100

2, 7, 12, 17

Add 5

200

The first number is 3. The rule is to multiply by 4.

3, 12, ____, 

48

200

Find the next number in this sequence:
2,   3,   5,   8,   12, ____

17

200

6, 27, 48

Add 21

300

The first number is 900. The rule is to subtract 20. What is the next number in the pattern?

900, ____, 

880

300

Find the missing number in this sequence: 

71,    63,    55,    __,    39

47

300

2, 6, 18, 54, 162

Multiply by 3
400

The first number is 125. The rule is to divide by 5.

125, 25, _____, 

5

400

Find the missing number in this sequence:

2,    2,    4,    8,    14,    22, _____ ,    44

32

400

63, 21, 7

Divide by 3

500

The first number is 320. The rule is to divide by 4.

320, _____, 

80

500

Find the missing number in this sequence: 

1, 3, 9, 27, ____

81

500

1, 4, 10, 22, 46

Multiply by 2 then add 2

M
e
n
u
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500