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 67 · 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: 13, 15, ____, 19, 21.
17
The sequence increases by 2 each step: 15 + 2 = 17.
2. Find the missing number in the sequence: 6, 8, ____, 12, 14.
10
The sequence increases by 2 each step: 8 + 2 = 10.
3. Find the missing number in the sequence: 1, 2, ____, 4, 5.
3
The sequence increases by 1 each step: 2 + 1 = 3.
4. Find the missing number in the sequence: 10, 12, ____, 16, 18.
14
The sequence increases by 2 each step: 12 + 2 = 14.
5. Find the missing number in the sequence: 8, 13, ____, 23, 28.
18
The sequence increases by 5 each step: 13 + 5 = 18.
6. Find the missing number in the sequence: 12, 17, ____, 27, 32.
22
The sequence increases by 5 each step: 17 + 5 = 22.
7. Find the missing number in the sequence: 7, 12, ____, 22, 27.
17
The sequence increases by 5 each step: 12 + 5 = 17.
8. Find the missing number in the sequence: 5, 6, ____, 8, 9.
7
The sequence increases by 1 each step: 6 + 1 = 7.
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: 9, 14, ____, 24, 29.
19
The sequence increases by 5 each step: 14 + 5 = 19.
11. Find the missing number in the sequence: 20, 22, ____, 26, 28.
24
The sequence increases by 2 each step: 22 + 2 = 24.
12. Find the missing number in the sequence: 1, 3, ____, 7, 9.
5
The sequence increases by 2 each step: 3 + 2 = 5.

12 questions · Seed 67 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 4-6

Take your time. Show your thinking.

12 questions · Seed 67 · 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: 13, 15, ____, 19, 21.
17
The sequence increases by 2 each step: 15 + 2 = 17.
2. Find the missing number in the sequence: 6, 8, ____, 12, 14.
10
The sequence increases by 2 each step: 8 + 2 = 10.
3. Find the missing number in the sequence: 1, 2, ____, 4, 5.
3
The sequence increases by 1 each step: 2 + 1 = 3.
4. Find the missing number in the sequence: 10, 12, ____, 16, 18.
14
The sequence increases by 2 each step: 12 + 2 = 14.
5. Find the missing number in the sequence: 8, 13, ____, 23, 28.
18
The sequence increases by 5 each step: 13 + 5 = 18.
6. Find the missing number in the sequence: 12, 17, ____, 27, 32.
22
The sequence increases by 5 each step: 17 + 5 = 22.
7. Find the missing number in the sequence: 7, 12, ____, 22, 27.
17
The sequence increases by 5 each step: 12 + 5 = 17.
8. Find the missing number in the sequence: 5, 6, ____, 8, 9.
7
The sequence increases by 1 each step: 6 + 1 = 7.
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: 9, 14, ____, 24, 29.
19
The sequence increases by 5 each step: 14 + 5 = 19.
11. Find the missing number in the sequence: 20, 22, ____, 26, 28.
24
The sequence increases by 2 each step: 22 + 2 = 24.
12. Find the missing number in the sequence: 1, 3, ____, 7, 9.
5
The sequence increases by 2 each step: 3 + 2 = 5.

12 questions · Seed 67 · Age guidance, not curriculum certification