ReasoningAges 7-9

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 7-9

Take your time. Show your thinking.

12 questions · Seed 104739 · Age guidance, not curriculum certification

View the answer key

Worksheet StudioAnswer key · Ages 7-9

Answers and reasoning. Review before teaching.

1. Find the missing number in the sequence: 14, 23, ____, 41, 50.
32
The sequence increases by 9 each step: 23 + 9 = 32.
2. Find the missing number in the sequence: 10, 14, ____, 22, 26.
18
The sequence increases by 4 each step: 14 + 4 = 18.
3. Find the missing number in the sequence: 14, 22, ____, 38, 46.
30
The sequence increases by 8 each step: 22 + 8 = 30.
4. Find the missing number in the sequence: 9, 12, ____, 18, 21.
15
The sequence increases by 3 each step: 12 + 3 = 15.
5. Find the missing number in the sequence: 13, 23, ____, 43, 53.
33
The sequence increases by 10 each step: 23 + 10 = 33.
6. Find the missing number in the sequence: 14, 18, ____, 26, 30.
22
The sequence increases by 4 each step: 18 + 4 = 22.
7. Find the missing number in the sequence: 3, 6, ____, 12, 15.
9
The sequence increases by 3 each step: 6 + 3 = 9.
8. Find the missing number in the sequence: 20, 27, ____, 41, 48.
34
The sequence increases by 7 each step: 27 + 7 = 34.
9. Find the missing number in the sequence: 13, 20, ____, 34, 41.
27
The sequence increases by 7 each step: 20 + 7 = 27.
10. Find the missing number in the sequence: 11, 20, ____, 38, 47.
29
The sequence increases by 9 each step: 20 + 9 = 29.
11. Find the missing number in the sequence: 19, 25, ____, 37, 43.
31
The sequence increases by 6 each step: 25 + 6 = 31.
12. Find the missing number in the sequence: 1, 7, ____, 19, 25.
13
The sequence increases by 6 each step: 7 + 6 = 13.

12 questions · Seed 104739 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 7-9

Take your time. Show your thinking.

12 questions · Seed 104739 · Age guidance, not curriculum certification

Worksheet StudioAnswer key · Ages 7-9

Answers and reasoning. Review before teaching.

1. Find the missing number in the sequence: 14, 23, ____, 41, 50.
32
The sequence increases by 9 each step: 23 + 9 = 32.
2. Find the missing number in the sequence: 10, 14, ____, 22, 26.
18
The sequence increases by 4 each step: 14 + 4 = 18.
3. Find the missing number in the sequence: 14, 22, ____, 38, 46.
30
The sequence increases by 8 each step: 22 + 8 = 30.
4. Find the missing number in the sequence: 9, 12, ____, 18, 21.
15
The sequence increases by 3 each step: 12 + 3 = 15.
5. Find the missing number in the sequence: 13, 23, ____, 43, 53.
33
The sequence increases by 10 each step: 23 + 10 = 33.
6. Find the missing number in the sequence: 14, 18, ____, 26, 30.
22
The sequence increases by 4 each step: 18 + 4 = 22.
7. Find the missing number in the sequence: 3, 6, ____, 12, 15.
9
The sequence increases by 3 each step: 6 + 3 = 9.
8. Find the missing number in the sequence: 20, 27, ____, 41, 48.
34
The sequence increases by 7 each step: 27 + 7 = 34.
9. Find the missing number in the sequence: 13, 20, ____, 34, 41.
27
The sequence increases by 7 each step: 20 + 7 = 27.
10. Find the missing number in the sequence: 11, 20, ____, 38, 47.
29
The sequence increases by 9 each step: 20 + 9 = 29.
11. Find the missing number in the sequence: 19, 25, ____, 37, 43.
31
The sequence increases by 6 each step: 25 + 6 = 31.
12. Find the missing number in the sequence: 1, 7, ____, 19, 25.
13
The sequence increases by 6 each step: 7 + 6 = 13.

12 questions · Seed 104739 · Age guidance, not curriculum certification