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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: 10, 17, ____, 31, 38.
2. Find the missing number in the sequence: 4, 14, ____, 34, 44.
3. Find the missing number in the sequence: 3, 10, ____, 24, 31.
4. Find the missing number in the sequence: 1, 10, ____, 28, 37.
5. Find the missing number in the sequence: 2, 9, ____, 23, 30.
6. Find the missing number in the sequence: 6, 9, ____, 15, 18.
7. Find the missing number in the sequence: 16, 20, ____, 28, 32.
8. Find the missing number in the sequence: 1, 5, ____, 13, 17.
9. Find the missing number in the sequence: 4, 7, ____, 13, 16.
10. Find the missing number in the sequence: 9, 13, ____, 21, 25.
11. Find the missing number in the sequence: 3, 12, ____, 30, 39.
12. Find the missing number in the sequence: 20, 23, ____, 29, 32.
12 questions · Seed 97 · 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: 10, 17, ____, 31, 38.
24The sequence increases by 7 each step: 17 + 7 = 24.
2. Find the missing number in the sequence: 4, 14, ____, 34, 44.
24The sequence increases by 10 each step: 14 + 10 = 24.
3. Find the missing number in the sequence: 3, 10, ____, 24, 31.
17The sequence increases by 7 each step: 10 + 7 = 17.
4. Find the missing number in the sequence: 1, 10, ____, 28, 37.
19The sequence increases by 9 each step: 10 + 9 = 19.
5. Find the missing number in the sequence: 2, 9, ____, 23, 30.
16The sequence increases by 7 each step: 9 + 7 = 16.
6. Find the missing number in the sequence: 6, 9, ____, 15, 18.
12The sequence increases by 3 each step: 9 + 3 = 12.
7. Find the missing number in the sequence: 16, 20, ____, 28, 32.
24The sequence increases by 4 each step: 20 + 4 = 24.
8. Find the missing number in the sequence: 1, 5, ____, 13, 17.
9The sequence increases by 4 each step: 5 + 4 = 9.
9. Find the missing number in the sequence: 4, 7, ____, 13, 16.
10The sequence increases by 3 each step: 7 + 3 = 10.
10. Find the missing number in the sequence: 9, 13, ____, 21, 25.
17The sequence increases by 4 each step: 13 + 4 = 17.
11. Find the missing number in the sequence: 3, 12, ____, 30, 39.
21The sequence increases by 9 each step: 12 + 9 = 21.
12. Find the missing number in the sequence: 20, 23, ____, 29, 32.
26The sequence increases by 3 each step: 23 + 3 = 26.
12 questions · Seed 97 · 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: 10, 17, ____, 31, 38.
2. Find the missing number in the sequence: 4, 14, ____, 34, 44.
3. Find the missing number in the sequence: 3, 10, ____, 24, 31.
4. Find the missing number in the sequence: 1, 10, ____, 28, 37.
5. Find the missing number in the sequence: 2, 9, ____, 23, 30.
6. Find the missing number in the sequence: 6, 9, ____, 15, 18.
7. Find the missing number in the sequence: 16, 20, ____, 28, 32.
8. Find the missing number in the sequence: 1, 5, ____, 13, 17.
9. Find the missing number in the sequence: 4, 7, ____, 13, 16.
10. Find the missing number in the sequence: 9, 13, ____, 21, 25.
11. Find the missing number in the sequence: 3, 12, ____, 30, 39.
12. Find the missing number in the sequence: 20, 23, ____, 29, 32.
12 questions · Seed 97 · 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: 10, 17, ____, 31, 38.
24The sequence increases by 7 each step: 17 + 7 = 24.
2. Find the missing number in the sequence: 4, 14, ____, 34, 44.
24The sequence increases by 10 each step: 14 + 10 = 24.
3. Find the missing number in the sequence: 3, 10, ____, 24, 31.
17The sequence increases by 7 each step: 10 + 7 = 17.
4. Find the missing number in the sequence: 1, 10, ____, 28, 37.
19The sequence increases by 9 each step: 10 + 9 = 19.
5. Find the missing number in the sequence: 2, 9, ____, 23, 30.
16The sequence increases by 7 each step: 9 + 7 = 16.
6. Find the missing number in the sequence: 6, 9, ____, 15, 18.
12The sequence increases by 3 each step: 9 + 3 = 12.
7. Find the missing number in the sequence: 16, 20, ____, 28, 32.
24The sequence increases by 4 each step: 20 + 4 = 24.
8. Find the missing number in the sequence: 1, 5, ____, 13, 17.
9The sequence increases by 4 each step: 5 + 4 = 9.
9. Find the missing number in the sequence: 4, 7, ____, 13, 16.
10The sequence increases by 3 each step: 7 + 3 = 10.
10. Find the missing number in the sequence: 9, 13, ____, 21, 25.
17The sequence increases by 4 each step: 13 + 4 = 17.
11. Find the missing number in the sequence: 3, 12, ____, 30, 39.
21The sequence increases by 9 each step: 12 + 9 = 21.
12. Find the missing number in the sequence: 20, 23, ____, 29, 32.
26The sequence increases by 3 each step: 23 + 3 = 26.
12 questions · Seed 97 · Age guidance, not curriculum certification