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 71 · 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, 14, ____, 16, 17.
15
The sequence increases by 1 each step: 14 + 1 = 15.
2. Find the missing number in the sequence: 9, 10, ____, 12, 13.
11
The sequence increases by 1 each step: 10 + 1 = 11.
3. Find the missing number in the sequence: 17, 18, ____, 20, 21.
19
The sequence increases by 1 each step: 18 + 1 = 19.
4. Find the missing number in the sequence: 2, 4, ____, 8, 10.
6
The sequence increases by 2 each step: 4 + 2 = 6.
5. Find the missing number in the sequence: 9, 11, ____, 15, 17.
13
The sequence increases by 2 each step: 11 + 2 = 13.
6. Find the missing number in the sequence: 6, 7, ____, 9, 10.
8
The sequence increases by 1 each step: 7 + 1 = 8.
7. Find the missing number in the sequence: 18, 20, ____, 24, 26.
22
The sequence increases by 2 each step: 20 + 2 = 22.
8. Find the missing number in the sequence: 3, 5, ____, 9, 11.
7
The sequence increases by 2 each step: 5 + 2 = 7.
9. Find the missing number in the sequence: 4, 9, ____, 19, 24.
14
The sequence increases by 5 each step: 9 + 5 = 14.
10. Find the missing number in the sequence: 6, 8, ____, 12, 14.
10
The sequence increases by 2 each step: 8 + 2 = 10.
11. Find the missing number in the sequence: 8, 10, ____, 14, 16.
12
The sequence increases by 2 each step: 10 + 2 = 12.
12. Find the missing number in the sequence: 1, 2, ____, 4, 5.
3
The sequence increases by 1 each step: 2 + 1 = 3.

12 questions · Seed 71 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 4-6

Take your time. Show your thinking.

12 questions · Seed 71 · 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, 14, ____, 16, 17.
15
The sequence increases by 1 each step: 14 + 1 = 15.
2. Find the missing number in the sequence: 9, 10, ____, 12, 13.
11
The sequence increases by 1 each step: 10 + 1 = 11.
3. Find the missing number in the sequence: 17, 18, ____, 20, 21.
19
The sequence increases by 1 each step: 18 + 1 = 19.
4. Find the missing number in the sequence: 2, 4, ____, 8, 10.
6
The sequence increases by 2 each step: 4 + 2 = 6.
5. Find the missing number in the sequence: 9, 11, ____, 15, 17.
13
The sequence increases by 2 each step: 11 + 2 = 13.
6. Find the missing number in the sequence: 6, 7, ____, 9, 10.
8
The sequence increases by 1 each step: 7 + 1 = 8.
7. Find the missing number in the sequence: 18, 20, ____, 24, 26.
22
The sequence increases by 2 each step: 20 + 2 = 22.
8. Find the missing number in the sequence: 3, 5, ____, 9, 11.
7
The sequence increases by 2 each step: 5 + 2 = 7.
9. Find the missing number in the sequence: 4, 9, ____, 19, 24.
14
The sequence increases by 5 each step: 9 + 5 = 14.
10. Find the missing number in the sequence: 6, 8, ____, 12, 14.
10
The sequence increases by 2 each step: 8 + 2 = 10.
11. Find the missing number in the sequence: 8, 10, ____, 14, 16.
12
The sequence increases by 2 each step: 10 + 2 = 12.
12. Find the missing number in the sequence: 1, 2, ____, 4, 5.
3
The sequence increases by 1 each step: 2 + 1 = 3.

12 questions · Seed 71 · Age guidance, not curriculum certification