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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: 9, 13, ____, 21, 25.
2. Find the missing number in the sequence: 11, 17, ____, 29, 35.
3. Find the missing number in the sequence: 5, 14, ____, 32, 41.
4. Find the missing number in the sequence: 20, 27, ____, 41, 48.
5. Find the missing number in the sequence: 4, 11, ____, 25, 32.
6. Find the missing number in the sequence: 6, 9, ____, 15, 18.
7. Find the missing number in the sequence: 16, 24, ____, 40, 48.
8. Find the missing number in the sequence: 17, 26, ____, 44, 53.
9. Find the missing number in the sequence: 8, 11, ____, 17, 20.
10. Find the missing number in the sequence: 7, 15, ____, 31, 39.
11. Find the missing number in the sequence: 3, 9, ____, 21, 27.
12. Find the missing number in the sequence: 19, 23, ____, 31, 35.
12 questions · Seed 49 · 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: 9, 13, ____, 21, 25.
17The sequence increases by 4 each step: 13 + 4 = 17.
2. Find the missing number in the sequence: 11, 17, ____, 29, 35.
23The sequence increases by 6 each step: 17 + 6 = 23.
3. Find the missing number in the sequence: 5, 14, ____, 32, 41.
23The sequence increases by 9 each step: 14 + 9 = 23.
4. Find the missing number in the sequence: 20, 27, ____, 41, 48.
34The sequence increases by 7 each step: 27 + 7 = 34.
5. Find the missing number in the sequence: 4, 11, ____, 25, 32.
18The sequence increases by 7 each step: 11 + 7 = 18.
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, 24, ____, 40, 48.
32The sequence increases by 8 each step: 24 + 8 = 32.
8. Find the missing number in the sequence: 17, 26, ____, 44, 53.
35The sequence increases by 9 each step: 26 + 9 = 35.
9. Find the missing number in the sequence: 8, 11, ____, 17, 20.
14The sequence increases by 3 each step: 11 + 3 = 14.
10. Find the missing number in the sequence: 7, 15, ____, 31, 39.
23The sequence increases by 8 each step: 15 + 8 = 23.
11. Find the missing number in the sequence: 3, 9, ____, 21, 27.
15The sequence increases by 6 each step: 9 + 6 = 15.
12. Find the missing number in the sequence: 19, 23, ____, 31, 35.
27The sequence increases by 4 each step: 23 + 4 = 27.
12 questions · Seed 49 · 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: 9, 13, ____, 21, 25.
2. Find the missing number in the sequence: 11, 17, ____, 29, 35.
3. Find the missing number in the sequence: 5, 14, ____, 32, 41.
4. Find the missing number in the sequence: 20, 27, ____, 41, 48.
5. Find the missing number in the sequence: 4, 11, ____, 25, 32.
6. Find the missing number in the sequence: 6, 9, ____, 15, 18.
7. Find the missing number in the sequence: 16, 24, ____, 40, 48.
8. Find the missing number in the sequence: 17, 26, ____, 44, 53.
9. Find the missing number in the sequence: 8, 11, ____, 17, 20.
10. Find the missing number in the sequence: 7, 15, ____, 31, 39.
11. Find the missing number in the sequence: 3, 9, ____, 21, 27.
12. Find the missing number in the sequence: 19, 23, ____, 31, 35.
12 questions · Seed 49 · 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: 9, 13, ____, 21, 25.
17The sequence increases by 4 each step: 13 + 4 = 17.
2. Find the missing number in the sequence: 11, 17, ____, 29, 35.
23The sequence increases by 6 each step: 17 + 6 = 23.
3. Find the missing number in the sequence: 5, 14, ____, 32, 41.
23The sequence increases by 9 each step: 14 + 9 = 23.
4. Find the missing number in the sequence: 20, 27, ____, 41, 48.
34The sequence increases by 7 each step: 27 + 7 = 34.
5. Find the missing number in the sequence: 4, 11, ____, 25, 32.
18The sequence increases by 7 each step: 11 + 7 = 18.
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, 24, ____, 40, 48.
32The sequence increases by 8 each step: 24 + 8 = 32.
8. Find the missing number in the sequence: 17, 26, ____, 44, 53.
35The sequence increases by 9 each step: 26 + 9 = 35.
9. Find the missing number in the sequence: 8, 11, ____, 17, 20.
14The sequence increases by 3 each step: 11 + 3 = 14.
10. Find the missing number in the sequence: 7, 15, ____, 31, 39.
23The sequence increases by 8 each step: 15 + 8 = 23.
11. Find the missing number in the sequence: 3, 9, ____, 21, 27.
15The sequence increases by 6 each step: 9 + 6 = 15.
12. Find the missing number in the sequence: 19, 23, ____, 31, 35.
27The sequence increases by 4 each step: 23 + 4 = 27.
12 questions · Seed 49 · Age guidance, not curriculum certification