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 78 · 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: 9, 11, ____, 15, 17.
13
The sequence increases by 2 each step: 11 + 2 = 13.
2. Find the missing number in the sequence: 4, 9, ____, 19, 24.
14
The sequence increases by 5 each step: 9 + 5 = 14.
3. Find the missing number in the sequence: 12, 17, ____, 27, 32.
22
The sequence increases by 5 each step: 17 + 5 = 22.
4. Find the missing number in the sequence: 6, 8, ____, 12, 14.
10
The sequence increases by 2 each step: 8 + 2 = 10.
5. Find the missing number in the sequence: 5, 7, ____, 11, 13.
9
The sequence increases by 2 each step: 7 + 2 = 9.
6. Find the missing number in the sequence: 19, 20, ____, 22, 23.
21
The sequence increases by 1 each step: 20 + 1 = 21.
7. Find the missing number in the sequence: 16, 17, ____, 19, 20.
18
The sequence increases by 1 each step: 17 + 1 = 18.
8. Find the missing number in the sequence: 19, 21, ____, 25, 27.
23
The sequence increases by 2 each step: 21 + 2 = 23.
9. Find the missing number in the sequence: 3, 8, ____, 18, 23.
13
The sequence increases by 5 each step: 8 + 5 = 13.
10. Find the missing number in the sequence: 15, 16, ____, 18, 19.
17
The sequence increases by 1 each step: 16 + 1 = 17.
11. Find the missing number in the sequence: 7, 8, ____, 10, 11.
9
The sequence increases by 1 each step: 8 + 1 = 9.
12. Find the missing number in the sequence: 13, 14, ____, 16, 17.
15
The sequence increases by 1 each step: 14 + 1 = 15.

12 questions · Seed 78 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 4-6

Take your time. Show your thinking.

12 questions · Seed 78 · 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: 9, 11, ____, 15, 17.
13
The sequence increases by 2 each step: 11 + 2 = 13.
2. Find the missing number in the sequence: 4, 9, ____, 19, 24.
14
The sequence increases by 5 each step: 9 + 5 = 14.
3. Find the missing number in the sequence: 12, 17, ____, 27, 32.
22
The sequence increases by 5 each step: 17 + 5 = 22.
4. Find the missing number in the sequence: 6, 8, ____, 12, 14.
10
The sequence increases by 2 each step: 8 + 2 = 10.
5. Find the missing number in the sequence: 5, 7, ____, 11, 13.
9
The sequence increases by 2 each step: 7 + 2 = 9.
6. Find the missing number in the sequence: 19, 20, ____, 22, 23.
21
The sequence increases by 1 each step: 20 + 1 = 21.
7. Find the missing number in the sequence: 16, 17, ____, 19, 20.
18
The sequence increases by 1 each step: 17 + 1 = 18.
8. Find the missing number in the sequence: 19, 21, ____, 25, 27.
23
The sequence increases by 2 each step: 21 + 2 = 23.
9. Find the missing number in the sequence: 3, 8, ____, 18, 23.
13
The sequence increases by 5 each step: 8 + 5 = 13.
10. Find the missing number in the sequence: 15, 16, ____, 18, 19.
17
The sequence increases by 1 each step: 16 + 1 = 17.
11. Find the missing number in the sequence: 7, 8, ____, 10, 11.
9
The sequence increases by 1 each step: 8 + 1 = 9.
12. Find the missing number in the sequence: 13, 14, ____, 16, 17.
15
The sequence increases by 1 each step: 14 + 1 = 15.

12 questions · Seed 78 · Age guidance, not curriculum certification