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 76 · 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: 7, 10, ____, 16, 19.
13
The sequence increases by 3 each step: 10 + 3 = 13.
2. Find the missing number in the sequence: 8, 14, ____, 26, 32.
20
The sequence increases by 6 each step: 14 + 6 = 20.
3. Find the missing number in the sequence: 17, 25, ____, 41, 49.
33
The sequence increases by 8 each step: 25 + 8 = 33.
4. Find the missing number in the sequence: 2, 6, ____, 14, 18.
10
The sequence increases by 4 each step: 6 + 4 = 10.
5. Find the missing number in the sequence: 8, 11, ____, 17, 20.
14
The sequence increases by 3 each step: 11 + 3 = 14.
6. Find the missing number in the sequence: 13, 16, ____, 22, 25.
19
The sequence increases by 3 each step: 16 + 3 = 19.
7. Find the missing number in the sequence: 1, 11, ____, 31, 41.
21
The sequence increases by 10 each step: 11 + 10 = 21.
8. Find the missing number in the sequence: 16, 24, ____, 40, 48.
32
The sequence increases by 8 each step: 24 + 8 = 32.
9. Find the missing number in the sequence: 1, 8, ____, 22, 29.
15
The sequence increases by 7 each step: 8 + 7 = 15.
10. Find the missing number in the sequence: 5, 13, ____, 29, 37.
21
The sequence increases by 8 each step: 13 + 8 = 21.
11. Find the missing number in the sequence: 1, 5, ____, 13, 17.
9
The sequence increases by 4 each step: 5 + 4 = 9.
12. Find the missing number in the sequence: 9, 12, ____, 18, 21.
15
The sequence increases by 3 each step: 12 + 3 = 15.

12 questions · Seed 76 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 7-9

Take your time. Show your thinking.

12 questions · Seed 76 · 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: 7, 10, ____, 16, 19.
13
The sequence increases by 3 each step: 10 + 3 = 13.
2. Find the missing number in the sequence: 8, 14, ____, 26, 32.
20
The sequence increases by 6 each step: 14 + 6 = 20.
3. Find the missing number in the sequence: 17, 25, ____, 41, 49.
33
The sequence increases by 8 each step: 25 + 8 = 33.
4. Find the missing number in the sequence: 2, 6, ____, 14, 18.
10
The sequence increases by 4 each step: 6 + 4 = 10.
5. Find the missing number in the sequence: 8, 11, ____, 17, 20.
14
The sequence increases by 3 each step: 11 + 3 = 14.
6. Find the missing number in the sequence: 13, 16, ____, 22, 25.
19
The sequence increases by 3 each step: 16 + 3 = 19.
7. Find the missing number in the sequence: 1, 11, ____, 31, 41.
21
The sequence increases by 10 each step: 11 + 10 = 21.
8. Find the missing number in the sequence: 16, 24, ____, 40, 48.
32
The sequence increases by 8 each step: 24 + 8 = 32.
9. Find the missing number in the sequence: 1, 8, ____, 22, 29.
15
The sequence increases by 7 each step: 8 + 7 = 15.
10. Find the missing number in the sequence: 5, 13, ____, 29, 37.
21
The sequence increases by 8 each step: 13 + 8 = 21.
11. Find the missing number in the sequence: 1, 5, ____, 13, 17.
9
The sequence increases by 4 each step: 5 + 4 = 9.
12. Find the missing number in the sequence: 9, 12, ____, 18, 21.
15
The sequence increases by 3 each step: 12 + 3 = 15.

12 questions · Seed 76 · Age guidance, not curriculum certification