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 77 · 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: 10, 16, ____, 28, 34.
22
The sequence increases by 6 each step: 16 + 6 = 22.
2. Find the missing number in the sequence: 9, 13, ____, 21, 25.
17
The sequence increases by 4 each step: 13 + 4 = 17.
3. Find the missing number in the sequence: 5, 13, ____, 29, 37.
21
The sequence increases by 8 each step: 13 + 8 = 21.
4. Find the missing number in the sequence: 2, 9, ____, 23, 30.
16
The sequence increases by 7 each step: 9 + 7 = 16.
5. Find the missing number in the sequence: 2, 11, ____, 29, 38.
20
The sequence increases by 9 each step: 11 + 9 = 20.
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: 4, 10, ____, 22, 28.
16
The sequence increases by 6 each step: 10 + 6 = 16.
8. Find the missing number in the sequence: 16, 23, ____, 37, 44.
30
The sequence increases by 7 each step: 23 + 7 = 30.
9. Find the missing number in the sequence: 8, 12, ____, 20, 24.
16
The sequence increases by 4 each step: 12 + 4 = 16.
10. Find the missing number in the sequence: 16, 25, ____, 43, 52.
34
The sequence increases by 9 each step: 25 + 9 = 34.
11. Find the missing number in the sequence: 8, 18, ____, 38, 48.
28
The sequence increases by 10 each step: 18 + 10 = 28.
12. Find the missing number in the sequence: 12, 19, ____, 33, 40.
26
The sequence increases by 7 each step: 19 + 7 = 26.

12 questions · Seed 77 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 7-9

Take your time. Show your thinking.

12 questions · Seed 77 · 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: 10, 16, ____, 28, 34.
22
The sequence increases by 6 each step: 16 + 6 = 22.
2. Find the missing number in the sequence: 9, 13, ____, 21, 25.
17
The sequence increases by 4 each step: 13 + 4 = 17.
3. Find the missing number in the sequence: 5, 13, ____, 29, 37.
21
The sequence increases by 8 each step: 13 + 8 = 21.
4. Find the missing number in the sequence: 2, 9, ____, 23, 30.
16
The sequence increases by 7 each step: 9 + 7 = 16.
5. Find the missing number in the sequence: 2, 11, ____, 29, 38.
20
The sequence increases by 9 each step: 11 + 9 = 20.
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: 4, 10, ____, 22, 28.
16
The sequence increases by 6 each step: 10 + 6 = 16.
8. Find the missing number in the sequence: 16, 23, ____, 37, 44.
30
The sequence increases by 7 each step: 23 + 7 = 30.
9. Find the missing number in the sequence: 8, 12, ____, 20, 24.
16
The sequence increases by 4 each step: 12 + 4 = 16.
10. Find the missing number in the sequence: 16, 25, ____, 43, 52.
34
The sequence increases by 9 each step: 25 + 9 = 34.
11. Find the missing number in the sequence: 8, 18, ____, 38, 48.
28
The sequence increases by 10 each step: 18 + 10 = 28.
12. Find the missing number in the sequence: 12, 19, ____, 33, 40.
26
The sequence increases by 7 each step: 19 + 7 = 26.

12 questions · Seed 77 · Age guidance, not curriculum certification