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 94 · 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: 16, 18, ____, 22, 24.
20
The sequence increases by 2 each step: 18 + 2 = 20.
2. Find the missing number in the sequence: 17, 19, ____, 23, 25.
21
The sequence increases by 2 each step: 19 + 2 = 21.
3. Find the missing number in the sequence: 14, 19, ____, 29, 34.
24
The sequence increases by 5 each step: 19 + 5 = 24.
4. Find the missing number in the sequence: 13, 15, ____, 19, 21.
17
The sequence increases by 2 each step: 15 + 2 = 17.
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: 7, 9, ____, 13, 15.
11
The sequence increases by 2 each step: 9 + 2 = 11.
7. Find the missing number in the sequence: 6, 11, ____, 21, 26.
16
The sequence increases by 5 each step: 11 + 5 = 16.
8. Find the missing number in the sequence: 9, 14, ____, 24, 29.
19
The sequence increases by 5 each step: 14 + 5 = 19.
9. Find the missing number in the sequence: 1, 6, ____, 16, 21.
11
The sequence increases by 5 each step: 6 + 5 = 11.
10. Find the missing number in the sequence: 1, 2, ____, 4, 5.
3
The sequence increases by 1 each step: 2 + 1 = 3.
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: 8, 13, ____, 23, 28.
18
The sequence increases by 5 each step: 13 + 5 = 18.

12 questions · Seed 94 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 4-6

Take your time. Show your thinking.

12 questions · Seed 94 · 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: 16, 18, ____, 22, 24.
20
The sequence increases by 2 each step: 18 + 2 = 20.
2. Find the missing number in the sequence: 17, 19, ____, 23, 25.
21
The sequence increases by 2 each step: 19 + 2 = 21.
3. Find the missing number in the sequence: 14, 19, ____, 29, 34.
24
The sequence increases by 5 each step: 19 + 5 = 24.
4. Find the missing number in the sequence: 13, 15, ____, 19, 21.
17
The sequence increases by 2 each step: 15 + 2 = 17.
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: 7, 9, ____, 13, 15.
11
The sequence increases by 2 each step: 9 + 2 = 11.
7. Find the missing number in the sequence: 6, 11, ____, 21, 26.
16
The sequence increases by 5 each step: 11 + 5 = 16.
8. Find the missing number in the sequence: 9, 14, ____, 24, 29.
19
The sequence increases by 5 each step: 14 + 5 = 19.
9. Find the missing number in the sequence: 1, 6, ____, 16, 21.
11
The sequence increases by 5 each step: 6 + 5 = 11.
10. Find the missing number in the sequence: 1, 2, ____, 4, 5.
3
The sequence increases by 1 each step: 2 + 1 = 3.
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: 8, 13, ____, 23, 28.
18
The sequence increases by 5 each step: 13 + 5 = 18.

12 questions · Seed 94 · Age guidance, not curriculum certification