ReasoningAges 7-9

Missing sequence terms

Use the constant step size between terms to find the missing middle number in a sequence. Review suitability for your learners before teaching.

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Worksheet StudioPractice pack · Ages 7-9

Take your time. Show your thinking.

12 questions · Seed 94 · Age guidance, not curriculum certification

View the answer key

Worksheet StudioAnswer key · Ages 7-9

Answers and reasoning. Review before teaching.

1. Find the missing number in the sequence: 16, 22, ____, 34, 40.
28
The sequence increases by 6 each step: 22 + 6 = 28.
2. Find the missing number in the sequence: 17, 25, ____, 41, 49.
33
The sequence increases by 8 each step: 25 + 8 = 33.
3. Find the missing number in the sequence: 14, 24, ____, 44, 54.
34
The sequence increases by 10 each step: 24 + 10 = 34.
4. Find the missing number in the sequence: 13, 19, ____, 31, 37.
25
The sequence increases by 6 each step: 19 + 6 = 25.
5. Find the missing number in the sequence: 4, 8, ____, 16, 20.
12
The sequence increases by 4 each step: 8 + 4 = 12.
6. Find the missing number in the sequence: 7, 15, ____, 31, 39.
23
The sequence increases by 8 each step: 15 + 8 = 23.
7. Find the missing number in the sequence: 6, 16, ____, 36, 46.
26
The sequence increases by 10 each step: 16 + 10 = 26.
8. Find the missing number in the sequence: 9, 17, ____, 33, 41.
25
The sequence increases by 8 each step: 17 + 8 = 25.
9. Find the missing number in the sequence: 1, 11, ____, 31, 41.
21
The sequence increases by 10 each step: 11 + 10 = 21.
10. Find the missing number in the sequence: 1, 5, ____, 13, 17.
9
The sequence increases by 4 each step: 5 + 4 = 9.
11. Find the missing number in the sequence: 20, 28, ____, 44, 52.
36
The sequence increases by 8 each step: 28 + 8 = 36.
12. Find the missing number in the sequence: 4, 7, ____, 13, 16.
10
The sequence increases by 3 each step: 7 + 3 = 10.

12 questions · Seed 94 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 7-9

Take your time. Show your thinking.

12 questions · Seed 94 · Age guidance, not curriculum certification

Worksheet StudioAnswer key · Ages 7-9

Answers and reasoning. Review before teaching.

1. Find the missing number in the sequence: 16, 22, ____, 34, 40.
28
The sequence increases by 6 each step: 22 + 6 = 28.
2. Find the missing number in the sequence: 17, 25, ____, 41, 49.
33
The sequence increases by 8 each step: 25 + 8 = 33.
3. Find the missing number in the sequence: 14, 24, ____, 44, 54.
34
The sequence increases by 10 each step: 24 + 10 = 34.
4. Find the missing number in the sequence: 13, 19, ____, 31, 37.
25
The sequence increases by 6 each step: 19 + 6 = 25.
5. Find the missing number in the sequence: 4, 8, ____, 16, 20.
12
The sequence increases by 4 each step: 8 + 4 = 12.
6. Find the missing number in the sequence: 7, 15, ____, 31, 39.
23
The sequence increases by 8 each step: 15 + 8 = 23.
7. Find the missing number in the sequence: 6, 16, ____, 36, 46.
26
The sequence increases by 10 each step: 16 + 10 = 26.
8. Find the missing number in the sequence: 9, 17, ____, 33, 41.
25
The sequence increases by 8 each step: 17 + 8 = 25.
9. Find the missing number in the sequence: 1, 11, ____, 31, 41.
21
The sequence increases by 10 each step: 11 + 10 = 21.
10. Find the missing number in the sequence: 1, 5, ____, 13, 17.
9
The sequence increases by 4 each step: 5 + 4 = 9.
11. Find the missing number in the sequence: 20, 28, ____, 44, 52.
36
The sequence increases by 8 each step: 28 + 8 = 36.
12. Find the missing number in the sequence: 4, 7, ____, 13, 16.
10
The sequence increases by 3 each step: 7 + 3 = 10.

12 questions · Seed 94 · Age guidance, not curriculum certification