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 104749 · 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: 16, 19, ____, 25, 28.
22
The sequence increases by 3 each step: 19 + 3 = 22.
2. Find the missing number in the sequence: 7, 14, ____, 28, 35.
21
The sequence increases by 7 each step: 14 + 7 = 21.
3. Find the missing number in the sequence: 15, 19, ____, 27, 31.
23
The sequence increases by 4 each step: 19 + 4 = 23.
4. Find the missing number in the sequence: 18, 24, ____, 36, 42.
30
The sequence increases by 6 each step: 24 + 6 = 30.
5. Find the missing number in the sequence: 9, 15, ____, 27, 33.
21
The sequence increases by 6 each step: 15 + 6 = 21.
6. Find the missing number in the sequence: 11, 14, ____, 20, 23.
17
The sequence increases by 3 each step: 14 + 3 = 17.
7. Find the missing number in the sequence: 10, 18, ____, 34, 42.
26
The sequence increases by 8 each step: 18 + 8 = 26.
8. Find the missing number in the sequence: 5, 14, ____, 32, 41.
23
The sequence increases by 9 each step: 14 + 9 = 23.
9. Find the missing number in the sequence: 13, 23, ____, 43, 53.
33
The sequence increases by 10 each step: 23 + 10 = 33.
10. Find the missing number in the sequence: 9, 13, ____, 21, 25.
17
The sequence increases by 4 each step: 13 + 4 = 17.
11. Find the missing number in the sequence: 9, 12, ____, 18, 21.
15
The sequence increases by 3 each step: 12 + 3 = 15.
12. Find the missing number in the sequence: 8, 17, ____, 35, 44.
26
The sequence increases by 9 each step: 17 + 9 = 26.

12 questions · Seed 104749 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 7-9

Take your time. Show your thinking.

12 questions · Seed 104749 · 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: 16, 19, ____, 25, 28.
22
The sequence increases by 3 each step: 19 + 3 = 22.
2. Find the missing number in the sequence: 7, 14, ____, 28, 35.
21
The sequence increases by 7 each step: 14 + 7 = 21.
3. Find the missing number in the sequence: 15, 19, ____, 27, 31.
23
The sequence increases by 4 each step: 19 + 4 = 23.
4. Find the missing number in the sequence: 18, 24, ____, 36, 42.
30
The sequence increases by 6 each step: 24 + 6 = 30.
5. Find the missing number in the sequence: 9, 15, ____, 27, 33.
21
The sequence increases by 6 each step: 15 + 6 = 21.
6. Find the missing number in the sequence: 11, 14, ____, 20, 23.
17
The sequence increases by 3 each step: 14 + 3 = 17.
7. Find the missing number in the sequence: 10, 18, ____, 34, 42.
26
The sequence increases by 8 each step: 18 + 8 = 26.
8. Find the missing number in the sequence: 5, 14, ____, 32, 41.
23
The sequence increases by 9 each step: 14 + 9 = 23.
9. Find the missing number in the sequence: 13, 23, ____, 43, 53.
33
The sequence increases by 10 each step: 23 + 10 = 33.
10. Find the missing number in the sequence: 9, 13, ____, 21, 25.
17
The sequence increases by 4 each step: 13 + 4 = 17.
11. Find the missing number in the sequence: 9, 12, ____, 18, 21.
15
The sequence increases by 3 each step: 12 + 3 = 15.
12. Find the missing number in the sequence: 8, 17, ____, 35, 44.
26
The sequence increases by 9 each step: 17 + 9 = 26.

12 questions · Seed 104749 · Age guidance, not curriculum certification