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 83 · 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: 4, 6, ____, 10, 12.
8
The sequence increases by 2 each step: 6 + 2 = 8.
2. Find the missing number in the sequence: 20, 21, ____, 23, 24.
22
The sequence increases by 1 each step: 21 + 1 = 22.
3. Find the missing number in the sequence: 6, 8, ____, 12, 14.
10
The sequence increases by 2 each step: 8 + 2 = 10.
4. Find the missing number in the sequence: 10, 11, ____, 13, 14.
12
The sequence increases by 1 each step: 11 + 1 = 12.
5. Find the missing number in the sequence: 4, 5, ____, 7, 8.
6
The sequence increases by 1 each step: 5 + 1 = 6.
6. Find the missing number in the sequence: 9, 10, ____, 12, 13.
11
The sequence increases by 1 each step: 10 + 1 = 11.
7. Find the missing number in the sequence: 18, 23, ____, 33, 38.
28
The sequence increases by 5 each step: 23 + 5 = 28.
8. Find the missing number in the sequence: 11, 12, ____, 14, 15.
13
The sequence increases by 1 each step: 12 + 1 = 13.
9. Find the missing number in the sequence: 15, 17, ____, 21, 23.
19
The sequence increases by 2 each step: 17 + 2 = 19.
10. Find the missing number in the sequence: 1, 3, ____, 7, 9.
5
The sequence increases by 2 each step: 3 + 2 = 5.
11. Find the missing number in the sequence: 2, 3, ____, 5, 6.
4
The sequence increases by 1 each step: 3 + 1 = 4.
12. Find the missing number in the sequence: 18, 20, ____, 24, 26.
22
The sequence increases by 2 each step: 20 + 2 = 22.

12 questions · Seed 83 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 4-6

Take your time. Show your thinking.

12 questions · Seed 83 · 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: 4, 6, ____, 10, 12.
8
The sequence increases by 2 each step: 6 + 2 = 8.
2. Find the missing number in the sequence: 20, 21, ____, 23, 24.
22
The sequence increases by 1 each step: 21 + 1 = 22.
3. Find the missing number in the sequence: 6, 8, ____, 12, 14.
10
The sequence increases by 2 each step: 8 + 2 = 10.
4. Find the missing number in the sequence: 10, 11, ____, 13, 14.
12
The sequence increases by 1 each step: 11 + 1 = 12.
5. Find the missing number in the sequence: 4, 5, ____, 7, 8.
6
The sequence increases by 1 each step: 5 + 1 = 6.
6. Find the missing number in the sequence: 9, 10, ____, 12, 13.
11
The sequence increases by 1 each step: 10 + 1 = 11.
7. Find the missing number in the sequence: 18, 23, ____, 33, 38.
28
The sequence increases by 5 each step: 23 + 5 = 28.
8. Find the missing number in the sequence: 11, 12, ____, 14, 15.
13
The sequence increases by 1 each step: 12 + 1 = 13.
9. Find the missing number in the sequence: 15, 17, ____, 21, 23.
19
The sequence increases by 2 each step: 17 + 2 = 19.
10. Find the missing number in the sequence: 1, 3, ____, 7, 9.
5
The sequence increases by 2 each step: 3 + 2 = 5.
11. Find the missing number in the sequence: 2, 3, ____, 5, 6.
4
The sequence increases by 1 each step: 3 + 1 = 4.
12. Find the missing number in the sequence: 18, 20, ____, 24, 26.
22
The sequence increases by 2 each step: 20 + 2 = 22.

12 questions · Seed 83 · Age guidance, not curriculum certification