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 59 · 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: 1, 6, ____, 16, 21.
11
The sequence increases by 5 each step: 6 + 5 = 11.
2. Find the missing number in the sequence: 19, 20, ____, 22, 23.
21
The sequence increases by 1 each step: 20 + 1 = 21.
3. Find the missing number in the sequence: 10, 12, ____, 16, 18.
14
The sequence increases by 2 each step: 12 + 2 = 14.
4. Find the missing number in the sequence: 14, 19, ____, 29, 34.
24
The sequence increases by 5 each step: 19 + 5 = 24.
5. Find the missing number in the sequence: 13, 18, ____, 28, 33.
23
The sequence increases by 5 each step: 18 + 5 = 23.
6. Find the missing number in the sequence: 6, 8, ____, 12, 14.
10
The sequence increases by 2 each step: 8 + 2 = 10.
7. Find the missing number in the sequence: 4, 9, ____, 19, 24.
14
The sequence increases by 5 each step: 9 + 5 = 14.
8. Find the missing number in the sequence: 18, 20, ____, 24, 26.
22
The sequence increases by 2 each step: 20 + 2 = 22.
9. Find the missing number in the sequence: 6, 11, ____, 21, 26.
16
The sequence increases by 5 each step: 11 + 5 = 16.
10. Find the missing number in the sequence: 15, 17, ____, 21, 23.
19
The sequence increases by 2 each step: 17 + 2 = 19.
11. Find the missing number in the sequence: 3, 4, ____, 6, 7.
5
The sequence increases by 1 each step: 4 + 1 = 5.
12. Find the missing number in the sequence: 18, 23, ____, 33, 38.
28
The sequence increases by 5 each step: 23 + 5 = 28.

12 questions · Seed 59 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 4-6

Take your time. Show your thinking.

12 questions · Seed 59 · 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: 1, 6, ____, 16, 21.
11
The sequence increases by 5 each step: 6 + 5 = 11.
2. Find the missing number in the sequence: 19, 20, ____, 22, 23.
21
The sequence increases by 1 each step: 20 + 1 = 21.
3. Find the missing number in the sequence: 10, 12, ____, 16, 18.
14
The sequence increases by 2 each step: 12 + 2 = 14.
4. Find the missing number in the sequence: 14, 19, ____, 29, 34.
24
The sequence increases by 5 each step: 19 + 5 = 24.
5. Find the missing number in the sequence: 13, 18, ____, 28, 33.
23
The sequence increases by 5 each step: 18 + 5 = 23.
6. Find the missing number in the sequence: 6, 8, ____, 12, 14.
10
The sequence increases by 2 each step: 8 + 2 = 10.
7. Find the missing number in the sequence: 4, 9, ____, 19, 24.
14
The sequence increases by 5 each step: 9 + 5 = 14.
8. Find the missing number in the sequence: 18, 20, ____, 24, 26.
22
The sequence increases by 2 each step: 20 + 2 = 22.
9. Find the missing number in the sequence: 6, 11, ____, 21, 26.
16
The sequence increases by 5 each step: 11 + 5 = 16.
10. Find the missing number in the sequence: 15, 17, ____, 21, 23.
19
The sequence increases by 2 each step: 17 + 2 = 19.
11. Find the missing number in the sequence: 3, 4, ____, 6, 7.
5
The sequence increases by 1 each step: 4 + 1 = 5.
12. Find the missing number in the sequence: 18, 23, ____, 33, 38.
28
The sequence increases by 5 each step: 23 + 5 = 28.

12 questions · Seed 59 · Age guidance, not curriculum certification