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 104734 · 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: 17, 20, ____, 26, 29.
23
The sequence increases by 3 each step: 20 + 3 = 23.
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: 4, 11, ____, 25, 32.
18
The sequence increases by 7 each step: 11 + 7 = 18.
4. Find the missing number in the sequence: 19, 27, ____, 43, 51.
35
The sequence increases by 8 each step: 27 + 8 = 35.
5. Find the missing number in the sequence: 2, 8, ____, 20, 26.
14
The sequence increases by 6 each step: 8 + 6 = 14.
6. Find the missing number in the sequence: 7, 16, ____, 34, 43.
25
The sequence increases by 9 each step: 16 + 9 = 25.
7. Find the missing number in the sequence: 4, 7, ____, 13, 16.
10
The sequence increases by 3 each step: 7 + 3 = 10.
8. Find the missing number in the sequence: 20, 27, ____, 41, 48.
34
The sequence increases by 7 each step: 27 + 7 = 34.
9. Find the missing number in the sequence: 16, 19, ____, 25, 28.
22
The sequence increases by 3 each step: 19 + 3 = 22.
10. Find the missing number in the sequence: 3, 7, ____, 15, 19.
11
The sequence increases by 4 each step: 7 + 4 = 11.
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: 7, 15, ____, 31, 39.
23
The sequence increases by 8 each step: 15 + 8 = 23.

12 questions · Seed 104734 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 7-9

Take your time. Show your thinking.

12 questions · Seed 104734 · 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: 17, 20, ____, 26, 29.
23
The sequence increases by 3 each step: 20 + 3 = 23.
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: 4, 11, ____, 25, 32.
18
The sequence increases by 7 each step: 11 + 7 = 18.
4. Find the missing number in the sequence: 19, 27, ____, 43, 51.
35
The sequence increases by 8 each step: 27 + 8 = 35.
5. Find the missing number in the sequence: 2, 8, ____, 20, 26.
14
The sequence increases by 6 each step: 8 + 6 = 14.
6. Find the missing number in the sequence: 7, 16, ____, 34, 43.
25
The sequence increases by 9 each step: 16 + 9 = 25.
7. Find the missing number in the sequence: 4, 7, ____, 13, 16.
10
The sequence increases by 3 each step: 7 + 3 = 10.
8. Find the missing number in the sequence: 20, 27, ____, 41, 48.
34
The sequence increases by 7 each step: 27 + 7 = 34.
9. Find the missing number in the sequence: 16, 19, ____, 25, 28.
22
The sequence increases by 3 each step: 19 + 3 = 22.
10. Find the missing number in the sequence: 3, 7, ____, 15, 19.
11
The sequence increases by 4 each step: 7 + 4 = 11.
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: 7, 15, ____, 31, 39.
23
The sequence increases by 8 each step: 15 + 8 = 23.

12 questions · Seed 104734 · Age guidance, not curriculum certification