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.

Choose “Save as PDF” to keep a copy. Use your browser’s paper setting for A4 or Letter.

Worksheet StudioPractice pack · Ages 4-6

Take your time. Show your thinking.

12 questions · Seed 97 · 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: 10, 12, ____, 16, 18.
14
The sequence increases by 2 each step: 12 + 2 = 14.
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: 3, 5, ____, 9, 11.
7
The sequence increases by 2 each step: 5 + 2 = 7.
4. Find the missing number in the sequence: 1, 6, ____, 16, 21.
11
The sequence increases by 5 each step: 6 + 5 = 11.
5. Find the missing number in the sequence: 2, 4, ____, 8, 10.
6
The sequence increases by 2 each step: 4 + 2 = 6.
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: 16, 17, ____, 19, 20.
18
The sequence increases by 1 each step: 17 + 1 = 18.
8. Find the missing number in the sequence: 1, 2, ____, 4, 5.
3
The sequence increases by 1 each step: 2 + 1 = 3.
9. Find the missing number in the sequence: 4, 5, ____, 7, 8.
6
The sequence increases by 1 each step: 5 + 1 = 6.
10. Find the missing number in the sequence: 9, 10, ____, 12, 13.
11
The sequence increases by 1 each step: 10 + 1 = 11.
11. Find the missing number in the sequence: 3, 8, ____, 18, 23.
13
The sequence increases by 5 each step: 8 + 5 = 13.
12. Find the missing number in the sequence: 20, 21, ____, 23, 24.
22
The sequence increases by 1 each step: 21 + 1 = 22.

12 questions · Seed 97 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 4-6

Take your time. Show your thinking.

12 questions · Seed 97 · 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: 10, 12, ____, 16, 18.
14
The sequence increases by 2 each step: 12 + 2 = 14.
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: 3, 5, ____, 9, 11.
7
The sequence increases by 2 each step: 5 + 2 = 7.
4. Find the missing number in the sequence: 1, 6, ____, 16, 21.
11
The sequence increases by 5 each step: 6 + 5 = 11.
5. Find the missing number in the sequence: 2, 4, ____, 8, 10.
6
The sequence increases by 2 each step: 4 + 2 = 6.
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: 16, 17, ____, 19, 20.
18
The sequence increases by 1 each step: 17 + 1 = 18.
8. Find the missing number in the sequence: 1, 2, ____, 4, 5.
3
The sequence increases by 1 each step: 2 + 1 = 3.
9. Find the missing number in the sequence: 4, 5, ____, 7, 8.
6
The sequence increases by 1 each step: 5 + 1 = 6.
10. Find the missing number in the sequence: 9, 10, ____, 12, 13.
11
The sequence increases by 1 each step: 10 + 1 = 11.
11. Find the missing number in the sequence: 3, 8, ____, 18, 23.
13
The sequence increases by 5 each step: 8 + 5 = 13.
12. Find the missing number in the sequence: 20, 21, ____, 23, 24.
22
The sequence increases by 1 each step: 21 + 1 = 22.

12 questions · Seed 97 · Age guidance, not curriculum certification