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 108 · 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: 8, 10, ____, 14, 16.
12
The sequence increases by 2 each step: 10 + 2 = 12.
2. Find the missing number in the sequence: 2, 7, ____, 17, 22.
12
The sequence increases by 5 each step: 7 + 5 = 12.
3. Find the missing number in the sequence: 19, 21, ____, 25, 27.
23
The sequence increases by 2 each step: 21 + 2 = 23.
4. Find the missing number in the sequence: 19, 20, ____, 22, 23.
21
The sequence increases by 1 each step: 20 + 1 = 21.
5. Find the missing number in the sequence: 13, 14, ____, 16, 17.
15
The sequence increases by 1 each step: 14 + 1 = 15.
6. Find the missing number in the sequence: 18, 23, ____, 33, 38.
28
The sequence increases by 5 each step: 23 + 5 = 28.
7. Find the missing number in the sequence: 11, 12, ____, 14, 15.
13
The sequence increases by 1 each step: 12 + 1 = 13.
8. Find the missing number in the sequence: 9, 14, ____, 24, 29.
19
The sequence increases by 5 each step: 14 + 5 = 19.
9. Find the missing number in the sequence: 3, 5, ____, 9, 11.
7
The sequence increases by 2 each step: 5 + 2 = 7.
10. Find the missing number in the sequence: 10, 12, ____, 16, 18.
14
The sequence increases by 2 each step: 12 + 2 = 14.
11. Find the missing number in the sequence: 20, 21, ____, 23, 24.
22
The sequence increases by 1 each step: 21 + 1 = 22.
12. Find the missing number in the sequence: 12, 13, ____, 15, 16.
14
The sequence increases by 1 each step: 13 + 1 = 14.

12 questions · Seed 108 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 4-6

Take your time. Show your thinking.

12 questions · Seed 108 · 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: 8, 10, ____, 14, 16.
12
The sequence increases by 2 each step: 10 + 2 = 12.
2. Find the missing number in the sequence: 2, 7, ____, 17, 22.
12
The sequence increases by 5 each step: 7 + 5 = 12.
3. Find the missing number in the sequence: 19, 21, ____, 25, 27.
23
The sequence increases by 2 each step: 21 + 2 = 23.
4. Find the missing number in the sequence: 19, 20, ____, 22, 23.
21
The sequence increases by 1 each step: 20 + 1 = 21.
5. Find the missing number in the sequence: 13, 14, ____, 16, 17.
15
The sequence increases by 1 each step: 14 + 1 = 15.
6. Find the missing number in the sequence: 18, 23, ____, 33, 38.
28
The sequence increases by 5 each step: 23 + 5 = 28.
7. Find the missing number in the sequence: 11, 12, ____, 14, 15.
13
The sequence increases by 1 each step: 12 + 1 = 13.
8. Find the missing number in the sequence: 9, 14, ____, 24, 29.
19
The sequence increases by 5 each step: 14 + 5 = 19.
9. Find the missing number in the sequence: 3, 5, ____, 9, 11.
7
The sequence increases by 2 each step: 5 + 2 = 7.
10. Find the missing number in the sequence: 10, 12, ____, 16, 18.
14
The sequence increases by 2 each step: 12 + 2 = 14.
11. Find the missing number in the sequence: 20, 21, ____, 23, 24.
22
The sequence increases by 1 each step: 21 + 1 = 22.
12. Find the missing number in the sequence: 12, 13, ____, 15, 16.
14
The sequence increases by 1 each step: 13 + 1 = 14.

12 questions · Seed 108 · Age guidance, not curriculum certification