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 104756 · 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: 19, 23, ____, 31, 35.
27
The sequence increases by 4 each step: 23 + 4 = 27.
2. Find the missing number in the sequence: 2, 11, ____, 29, 38.
20
The sequence increases by 9 each step: 11 + 9 = 20.
3. Find the missing number in the sequence: 2, 12, ____, 32, 42.
22
The sequence increases by 10 each step: 12 + 10 = 22.
4. Find the missing number in the sequence: 12, 20, ____, 36, 44.
28
The sequence increases by 8 each step: 20 + 8 = 28.
5. Find the missing number in the sequence: 2, 5, ____, 11, 14.
8
The sequence increases by 3 each step: 5 + 3 = 8.
6. Find the missing number in the sequence: 5, 9, ____, 17, 21.
13
The sequence increases by 4 each step: 9 + 4 = 13.
7. Find the missing number in the sequence: 20, 28, ____, 44, 52.
36
The sequence increases by 8 each step: 28 + 8 = 36.
8. Find the missing number in the sequence: 17, 26, ____, 44, 53.
35
The sequence increases by 9 each step: 26 + 9 = 35.
9. Find the missing number in the sequence: 6, 14, ____, 30, 38.
22
The sequence increases by 8 each step: 14 + 8 = 22.
10. Find the missing number in the sequence: 15, 23, ____, 39, 47.
31
The sequence increases by 8 each step: 23 + 8 = 31.
11. Find the missing number in the sequence: 9, 17, ____, 33, 41.
25
The sequence increases by 8 each step: 17 + 8 = 25.
12. Find the missing number in the sequence: 19, 25, ____, 37, 43.
31
The sequence increases by 6 each step: 25 + 6 = 31.

12 questions · Seed 104756 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 7-9

Take your time. Show your thinking.

12 questions · Seed 104756 · 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: 19, 23, ____, 31, 35.
27
The sequence increases by 4 each step: 23 + 4 = 27.
2. Find the missing number in the sequence: 2, 11, ____, 29, 38.
20
The sequence increases by 9 each step: 11 + 9 = 20.
3. Find the missing number in the sequence: 2, 12, ____, 32, 42.
22
The sequence increases by 10 each step: 12 + 10 = 22.
4. Find the missing number in the sequence: 12, 20, ____, 36, 44.
28
The sequence increases by 8 each step: 20 + 8 = 28.
5. Find the missing number in the sequence: 2, 5, ____, 11, 14.
8
The sequence increases by 3 each step: 5 + 3 = 8.
6. Find the missing number in the sequence: 5, 9, ____, 17, 21.
13
The sequence increases by 4 each step: 9 + 4 = 13.
7. Find the missing number in the sequence: 20, 28, ____, 44, 52.
36
The sequence increases by 8 each step: 28 + 8 = 36.
8. Find the missing number in the sequence: 17, 26, ____, 44, 53.
35
The sequence increases by 9 each step: 26 + 9 = 35.
9. Find the missing number in the sequence: 6, 14, ____, 30, 38.
22
The sequence increases by 8 each step: 14 + 8 = 22.
10. Find the missing number in the sequence: 15, 23, ____, 39, 47.
31
The sequence increases by 8 each step: 23 + 8 = 31.
11. Find the missing number in the sequence: 9, 17, ____, 33, 41.
25
The sequence increases by 8 each step: 17 + 8 = 25.
12. Find the missing number in the sequence: 19, 25, ____, 37, 43.
31
The sequence increases by 6 each step: 25 + 6 = 31.

12 questions · Seed 104756 · Age guidance, not curriculum certification