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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.
Worksheet StudioPractice pack · Ages 7-9
Missing sequence terms
Take your time. Show your thinking.
1. Find the missing number in the sequence: 12, 22, ____, 42, 52.
2. Find the missing number in the sequence: 13, 20, ____, 34, 41.
3. Find the missing number in the sequence: 15, 25, ____, 45, 55.
4. Find the missing number in the sequence: 1, 8, ____, 22, 29.
5. Find the missing number in the sequence: 14, 20, ____, 32, 38.
6. Find the missing number in the sequence: 4, 7, ____, 13, 16.
7. Find the missing number in the sequence: 3, 12, ____, 30, 39.
8. Find the missing number in the sequence: 9, 15, ____, 27, 33.
9. Find the missing number in the sequence: 6, 9, ____, 15, 18.
10. Find the missing number in the sequence: 2, 9, ____, 23, 30.
11. Find the missing number in the sequence: 9, 16, ____, 30, 37.
12. Find the missing number in the sequence: 10, 18, ____, 34, 42.
12 questions · Seed 104748 · Age guidance, not curriculum certification
View the answer key
Worksheet StudioAnswer key · Ages 7-9
Missing sequence terms
Answers and reasoning. Review before teaching.
1. Find the missing number in the sequence: 12, 22, ____, 42, 52.
32The sequence increases by 10 each step: 22 + 10 = 32.
2. Find the missing number in the sequence: 13, 20, ____, 34, 41.
27The sequence increases by 7 each step: 20 + 7 = 27.
3. Find the missing number in the sequence: 15, 25, ____, 45, 55.
35The sequence increases by 10 each step: 25 + 10 = 35.
4. Find the missing number in the sequence: 1, 8, ____, 22, 29.
15The sequence increases by 7 each step: 8 + 7 = 15.
5. Find the missing number in the sequence: 14, 20, ____, 32, 38.
26The sequence increases by 6 each step: 20 + 6 = 26.
6. Find the missing number in the sequence: 4, 7, ____, 13, 16.
10The sequence increases by 3 each step: 7 + 3 = 10.
7. Find the missing number in the sequence: 3, 12, ____, 30, 39.
21The sequence increases by 9 each step: 12 + 9 = 21.
8. Find the missing number in the sequence: 9, 15, ____, 27, 33.
21The sequence increases by 6 each step: 15 + 6 = 21.
9. Find the missing number in the sequence: 6, 9, ____, 15, 18.
12The sequence increases by 3 each step: 9 + 3 = 12.
10. Find the missing number in the sequence: 2, 9, ____, 23, 30.
16The sequence increases by 7 each step: 9 + 7 = 16.
11. Find the missing number in the sequence: 9, 16, ____, 30, 37.
23The sequence increases by 7 each step: 16 + 7 = 23.
12. Find the missing number in the sequence: 10, 18, ____, 34, 42.
26The sequence increases by 8 each step: 18 + 8 = 26.
12 questions · Seed 104748 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 7-9
Missing sequence terms
Take your time. Show your thinking.
1. Find the missing number in the sequence: 12, 22, ____, 42, 52.
2. Find the missing number in the sequence: 13, 20, ____, 34, 41.
3. Find the missing number in the sequence: 15, 25, ____, 45, 55.
4. Find the missing number in the sequence: 1, 8, ____, 22, 29.
5. Find the missing number in the sequence: 14, 20, ____, 32, 38.
6. Find the missing number in the sequence: 4, 7, ____, 13, 16.
7. Find the missing number in the sequence: 3, 12, ____, 30, 39.
8. Find the missing number in the sequence: 9, 15, ____, 27, 33.
9. Find the missing number in the sequence: 6, 9, ____, 15, 18.
10. Find the missing number in the sequence: 2, 9, ____, 23, 30.
11. Find the missing number in the sequence: 9, 16, ____, 30, 37.
12. Find the missing number in the sequence: 10, 18, ____, 34, 42.
12 questions · Seed 104748 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 7-9
Missing sequence terms
Answers and reasoning. Review before teaching.
1. Find the missing number in the sequence: 12, 22, ____, 42, 52.
32The sequence increases by 10 each step: 22 + 10 = 32.
2. Find the missing number in the sequence: 13, 20, ____, 34, 41.
27The sequence increases by 7 each step: 20 + 7 = 27.
3. Find the missing number in the sequence: 15, 25, ____, 45, 55.
35The sequence increases by 10 each step: 25 + 10 = 35.
4. Find the missing number in the sequence: 1, 8, ____, 22, 29.
15The sequence increases by 7 each step: 8 + 7 = 15.
5. Find the missing number in the sequence: 14, 20, ____, 32, 38.
26The sequence increases by 6 each step: 20 + 6 = 26.
6. Find the missing number in the sequence: 4, 7, ____, 13, 16.
10The sequence increases by 3 each step: 7 + 3 = 10.
7. Find the missing number in the sequence: 3, 12, ____, 30, 39.
21The sequence increases by 9 each step: 12 + 9 = 21.
8. Find the missing number in the sequence: 9, 15, ____, 27, 33.
21The sequence increases by 6 each step: 15 + 6 = 21.
9. Find the missing number in the sequence: 6, 9, ____, 15, 18.
12The sequence increases by 3 each step: 9 + 3 = 12.
10. Find the missing number in the sequence: 2, 9, ____, 23, 30.
16The sequence increases by 7 each step: 9 + 7 = 16.
11. Find the missing number in the sequence: 9, 16, ____, 30, 37.
23The sequence increases by 7 each step: 16 + 7 = 23.
12. Find the missing number in the sequence: 10, 18, ____, 34, 42.
26The sequence increases by 8 each step: 18 + 8 = 26.
12 questions · Seed 104748 · Age guidance, not curriculum certification