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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: 2, 11, ____, 29, 38.
2. Find the missing number in the sequence: 14, 22, ____, 38, 46.
3. Find the missing number in the sequence: 13, 17, ____, 25, 29.
4. Find the missing number in the sequence: 9, 18, ____, 36, 45.
5. Find the missing number in the sequence: 9, 16, ____, 30, 37.
6. Find the missing number in the sequence: 2, 8, ____, 20, 26.
7. Find the missing number in the sequence: 3, 13, ____, 33, 43.
8. Find the missing number in the sequence: 19, 29, ____, 49, 59.
9. Find the missing number in the sequence: 13, 23, ____, 43, 53.
10. Find the missing number in the sequence: 16, 23, ____, 37, 44.
11. Find the missing number in the sequence: 7, 15, ____, 31, 39.
12. Find the missing number in the sequence: 2, 5, ____, 11, 14.
12 questions · Seed 52 · 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: 2, 11, ____, 29, 38.
20The sequence increases by 9 each step: 11 + 9 = 20.
2. Find the missing number in the sequence: 14, 22, ____, 38, 46.
30The sequence increases by 8 each step: 22 + 8 = 30.
3. Find the missing number in the sequence: 13, 17, ____, 25, 29.
21The sequence increases by 4 each step: 17 + 4 = 21.
4. Find the missing number in the sequence: 9, 18, ____, 36, 45.
27The sequence increases by 9 each step: 18 + 9 = 27.
5. Find the missing number in the sequence: 9, 16, ____, 30, 37.
23The sequence increases by 7 each step: 16 + 7 = 23.
6. Find the missing number in the sequence: 2, 8, ____, 20, 26.
14The sequence increases by 6 each step: 8 + 6 = 14.
7. Find the missing number in the sequence: 3, 13, ____, 33, 43.
23The sequence increases by 10 each step: 13 + 10 = 23.
8. Find the missing number in the sequence: 19, 29, ____, 49, 59.
39The sequence increases by 10 each step: 29 + 10 = 39.
9. Find the missing number in the sequence: 13, 23, ____, 43, 53.
33The sequence increases by 10 each step: 23 + 10 = 33.
10. Find the missing number in the sequence: 16, 23, ____, 37, 44.
30The sequence increases by 7 each step: 23 + 7 = 30.
11. Find the missing number in the sequence: 7, 15, ____, 31, 39.
23The sequence increases by 8 each step: 15 + 8 = 23.
12. Find the missing number in the sequence: 2, 5, ____, 11, 14.
8The sequence increases by 3 each step: 5 + 3 = 8.
12 questions · Seed 52 · 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: 2, 11, ____, 29, 38.
2. Find the missing number in the sequence: 14, 22, ____, 38, 46.
3. Find the missing number in the sequence: 13, 17, ____, 25, 29.
4. Find the missing number in the sequence: 9, 18, ____, 36, 45.
5. Find the missing number in the sequence: 9, 16, ____, 30, 37.
6. Find the missing number in the sequence: 2, 8, ____, 20, 26.
7. Find the missing number in the sequence: 3, 13, ____, 33, 43.
8. Find the missing number in the sequence: 19, 29, ____, 49, 59.
9. Find the missing number in the sequence: 13, 23, ____, 43, 53.
10. Find the missing number in the sequence: 16, 23, ____, 37, 44.
11. Find the missing number in the sequence: 7, 15, ____, 31, 39.
12. Find the missing number in the sequence: 2, 5, ____, 11, 14.
12 questions · Seed 52 · 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: 2, 11, ____, 29, 38.
20The sequence increases by 9 each step: 11 + 9 = 20.
2. Find the missing number in the sequence: 14, 22, ____, 38, 46.
30The sequence increases by 8 each step: 22 + 8 = 30.
3. Find the missing number in the sequence: 13, 17, ____, 25, 29.
21The sequence increases by 4 each step: 17 + 4 = 21.
4. Find the missing number in the sequence: 9, 18, ____, 36, 45.
27The sequence increases by 9 each step: 18 + 9 = 27.
5. Find the missing number in the sequence: 9, 16, ____, 30, 37.
23The sequence increases by 7 each step: 16 + 7 = 23.
6. Find the missing number in the sequence: 2, 8, ____, 20, 26.
14The sequence increases by 6 each step: 8 + 6 = 14.
7. Find the missing number in the sequence: 3, 13, ____, 33, 43.
23The sequence increases by 10 each step: 13 + 10 = 23.
8. Find the missing number in the sequence: 19, 29, ____, 49, 59.
39The sequence increases by 10 each step: 29 + 10 = 39.
9. Find the missing number in the sequence: 13, 23, ____, 43, 53.
33The sequence increases by 10 each step: 23 + 10 = 33.
10. Find the missing number in the sequence: 16, 23, ____, 37, 44.
30The sequence increases by 7 each step: 23 + 7 = 30.
11. Find the missing number in the sequence: 7, 15, ____, 31, 39.
23The sequence increases by 8 each step: 15 + 8 = 23.
12. Find the missing number in the sequence: 2, 5, ____, 11, 14.
8The sequence increases by 3 each step: 5 + 3 = 8.
12 questions · Seed 52 · Age guidance, not curriculum certification