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 56 · 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: 2, 8, ____, 20, 26.
14
The sequence increases by 6 each step: 8 + 6 = 14.
2. Find the missing number in the sequence: 17, 24, ____, 38, 45.
31
The sequence increases by 7 each step: 24 + 7 = 31.
3. Find the missing number in the sequence: 9, 16, ____, 30, 37.
23
The sequence increases by 7 each step: 16 + 7 = 23.
4. Find the missing number in the sequence: 2, 11, ____, 29, 38.
20
The sequence increases by 9 each step: 11 + 9 = 20.
5. Find the missing number in the sequence: 11, 17, ____, 29, 35.
23
The sequence increases by 6 each step: 17 + 6 = 23.
6. Find the missing number in the sequence: 3, 11, ____, 27, 35.
19
The sequence increases by 8 each step: 11 + 8 = 19.
7. Find the missing number in the sequence: 2, 6, ____, 14, 18.
10
The sequence increases by 4 each step: 6 + 4 = 10.
8. Find the missing number in the sequence: 4, 13, ____, 31, 40.
22
The sequence increases by 9 each step: 13 + 9 = 22.
9. Find the missing number in the sequence: 7, 16, ____, 34, 43.
25
The sequence increases by 9 each step: 16 + 9 = 25.
10. Find the missing number in the sequence: 17, 26, ____, 44, 53.
35
The sequence increases by 9 each step: 26 + 9 = 35.
11. Find the missing number in the sequence: 4, 11, ____, 25, 32.
18
The sequence increases by 7 each step: 11 + 7 = 18.
12. Find the missing number in the sequence: 16, 19, ____, 25, 28.
22
The sequence increases by 3 each step: 19 + 3 = 22.

12 questions · Seed 56 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 7-9

Take your time. Show your thinking.

12 questions · Seed 56 · 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: 2, 8, ____, 20, 26.
14
The sequence increases by 6 each step: 8 + 6 = 14.
2. Find the missing number in the sequence: 17, 24, ____, 38, 45.
31
The sequence increases by 7 each step: 24 + 7 = 31.
3. Find the missing number in the sequence: 9, 16, ____, 30, 37.
23
The sequence increases by 7 each step: 16 + 7 = 23.
4. Find the missing number in the sequence: 2, 11, ____, 29, 38.
20
The sequence increases by 9 each step: 11 + 9 = 20.
5. Find the missing number in the sequence: 11, 17, ____, 29, 35.
23
The sequence increases by 6 each step: 17 + 6 = 23.
6. Find the missing number in the sequence: 3, 11, ____, 27, 35.
19
The sequence increases by 8 each step: 11 + 8 = 19.
7. Find the missing number in the sequence: 2, 6, ____, 14, 18.
10
The sequence increases by 4 each step: 6 + 4 = 10.
8. Find the missing number in the sequence: 4, 13, ____, 31, 40.
22
The sequence increases by 9 each step: 13 + 9 = 22.
9. Find the missing number in the sequence: 7, 16, ____, 34, 43.
25
The sequence increases by 9 each step: 16 + 9 = 25.
10. Find the missing number in the sequence: 17, 26, ____, 44, 53.
35
The sequence increases by 9 each step: 26 + 9 = 35.
11. Find the missing number in the sequence: 4, 11, ____, 25, 32.
18
The sequence increases by 7 each step: 11 + 7 = 18.
12. Find the missing number in the sequence: 16, 19, ____, 25, 28.
22
The sequence increases by 3 each step: 19 + 3 = 22.

12 questions · Seed 56 · Age guidance, not curriculum certification