ReasoningAges 4-6

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 4-6

Take your time. Show your thinking.

12 questions · Seed 57 · Age guidance, not curriculum certification

View the answer key

Worksheet StudioAnswer key · Ages 4-6

Answers and reasoning. Review before teaching.

1. Find the missing number in the sequence: 9, 10, ____, 12, 13.
11
The sequence increases by 1 each step: 10 + 1 = 11.
2. Find the missing number in the sequence: 16, 18, ____, 22, 24.
20
The sequence increases by 2 each step: 18 + 2 = 20.
3. Find the missing number in the sequence: 20, 21, ____, 23, 24.
22
The sequence increases by 1 each step: 21 + 1 = 22.
4. Find the missing number in the sequence: 13, 15, ____, 19, 21.
17
The sequence increases by 2 each step: 15 + 2 = 17.
5. Find the missing number in the sequence: 7, 8, ____, 10, 11.
9
The sequence increases by 1 each step: 8 + 1 = 9.
6. Find the missing number in the sequence: 10, 11, ____, 13, 14.
12
The sequence increases by 1 each step: 11 + 1 = 12.
7. Find the missing number in the sequence: 11, 16, ____, 26, 31.
21
The sequence increases by 5 each step: 16 + 5 = 21.
8. Find the missing number in the sequence: 6, 7, ____, 9, 10.
8
The sequence increases by 1 each step: 7 + 1 = 8.
9. Find the missing number in the sequence: 8, 13, ____, 23, 28.
18
The sequence increases by 5 each step: 13 + 5 = 18.
10. Find the missing number in the sequence: 3, 5, ____, 9, 11.
7
The sequence increases by 2 each step: 5 + 2 = 7.
11. Find the missing number in the sequence: 4, 9, ____, 19, 24.
14
The sequence increases by 5 each step: 9 + 5 = 14.
12. Find the missing number in the sequence: 7, 12, ____, 22, 27.
17
The sequence increases by 5 each step: 12 + 5 = 17.

12 questions · Seed 57 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 4-6

Take your time. Show your thinking.

12 questions · Seed 57 · Age guidance, not curriculum certification

Worksheet StudioAnswer key · Ages 4-6

Answers and reasoning. Review before teaching.

1. Find the missing number in the sequence: 9, 10, ____, 12, 13.
11
The sequence increases by 1 each step: 10 + 1 = 11.
2. Find the missing number in the sequence: 16, 18, ____, 22, 24.
20
The sequence increases by 2 each step: 18 + 2 = 20.
3. Find the missing number in the sequence: 20, 21, ____, 23, 24.
22
The sequence increases by 1 each step: 21 + 1 = 22.
4. Find the missing number in the sequence: 13, 15, ____, 19, 21.
17
The sequence increases by 2 each step: 15 + 2 = 17.
5. Find the missing number in the sequence: 7, 8, ____, 10, 11.
9
The sequence increases by 1 each step: 8 + 1 = 9.
6. Find the missing number in the sequence: 10, 11, ____, 13, 14.
12
The sequence increases by 1 each step: 11 + 1 = 12.
7. Find the missing number in the sequence: 11, 16, ____, 26, 31.
21
The sequence increases by 5 each step: 16 + 5 = 21.
8. Find the missing number in the sequence: 6, 7, ____, 9, 10.
8
The sequence increases by 1 each step: 7 + 1 = 8.
9. Find the missing number in the sequence: 8, 13, ____, 23, 28.
18
The sequence increases by 5 each step: 13 + 5 = 18.
10. Find the missing number in the sequence: 3, 5, ____, 9, 11.
7
The sequence increases by 2 each step: 5 + 2 = 7.
11. Find the missing number in the sequence: 4, 9, ____, 19, 24.
14
The sequence increases by 5 each step: 9 + 5 = 14.
12. Find the missing number in the sequence: 7, 12, ____, 22, 27.
17
The sequence increases by 5 each step: 12 + 5 = 17.

12 questions · Seed 57 · Age guidance, not curriculum certification