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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: 13, 16, ____, 22, 25.
2. Find the missing number in the sequence: 18, 22, ____, 30, 34.
3. Find the missing number in the sequence: 3, 11, ____, 27, 35.
4. Find the missing number in the sequence: 8, 17, ____, 35, 44.
5. Find the missing number in the sequence: 2, 5, ____, 11, 14.
6. Find the missing number in the sequence: 10, 20, ____, 40, 50.
7. Find the missing number in the sequence: 13, 20, ____, 34, 41.
8. Find the missing number in the sequence: 1, 11, ____, 31, 41.
9. Find the missing number in the sequence: 15, 23, ____, 39, 47.
10. Find the missing number in the sequence: 20, 28, ____, 44, 52.
11. Find the missing number in the sequence: 14, 17, ____, 23, 26.
12. Find the missing number in the sequence: 14, 24, ____, 44, 54.
12 questions · Seed 64 · 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: 13, 16, ____, 22, 25.
19The sequence increases by 3 each step: 16 + 3 = 19.
2. Find the missing number in the sequence: 18, 22, ____, 30, 34.
26The sequence increases by 4 each step: 22 + 4 = 26.
3. Find the missing number in the sequence: 3, 11, ____, 27, 35.
19The sequence increases by 8 each step: 11 + 8 = 19.
4. Find the missing number in the sequence: 8, 17, ____, 35, 44.
26The sequence increases by 9 each step: 17 + 9 = 26.
5. Find the missing number in the sequence: 2, 5, ____, 11, 14.
8The sequence increases by 3 each step: 5 + 3 = 8.
6. Find the missing number in the sequence: 10, 20, ____, 40, 50.
30The sequence increases by 10 each step: 20 + 10 = 30.
7. Find the missing number in the sequence: 13, 20, ____, 34, 41.
27The sequence increases by 7 each step: 20 + 7 = 27.
8. Find the missing number in the sequence: 1, 11, ____, 31, 41.
21The sequence increases by 10 each step: 11 + 10 = 21.
9. Find the missing number in the sequence: 15, 23, ____, 39, 47.
31The sequence increases by 8 each step: 23 + 8 = 31.
10. Find the missing number in the sequence: 20, 28, ____, 44, 52.
36The sequence increases by 8 each step: 28 + 8 = 36.
11. Find the missing number in the sequence: 14, 17, ____, 23, 26.
20The sequence increases by 3 each step: 17 + 3 = 20.
12. Find the missing number in the sequence: 14, 24, ____, 44, 54.
34The sequence increases by 10 each step: 24 + 10 = 34.
12 questions · Seed 64 · 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: 13, 16, ____, 22, 25.
2. Find the missing number in the sequence: 18, 22, ____, 30, 34.
3. Find the missing number in the sequence: 3, 11, ____, 27, 35.
4. Find the missing number in the sequence: 8, 17, ____, 35, 44.
5. Find the missing number in the sequence: 2, 5, ____, 11, 14.
6. Find the missing number in the sequence: 10, 20, ____, 40, 50.
7. Find the missing number in the sequence: 13, 20, ____, 34, 41.
8. Find the missing number in the sequence: 1, 11, ____, 31, 41.
9. Find the missing number in the sequence: 15, 23, ____, 39, 47.
10. Find the missing number in the sequence: 20, 28, ____, 44, 52.
11. Find the missing number in the sequence: 14, 17, ____, 23, 26.
12. Find the missing number in the sequence: 14, 24, ____, 44, 54.
12 questions · Seed 64 · 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: 13, 16, ____, 22, 25.
19The sequence increases by 3 each step: 16 + 3 = 19.
2. Find the missing number in the sequence: 18, 22, ____, 30, 34.
26The sequence increases by 4 each step: 22 + 4 = 26.
3. Find the missing number in the sequence: 3, 11, ____, 27, 35.
19The sequence increases by 8 each step: 11 + 8 = 19.
4. Find the missing number in the sequence: 8, 17, ____, 35, 44.
26The sequence increases by 9 each step: 17 + 9 = 26.
5. Find the missing number in the sequence: 2, 5, ____, 11, 14.
8The sequence increases by 3 each step: 5 + 3 = 8.
6. Find the missing number in the sequence: 10, 20, ____, 40, 50.
30The sequence increases by 10 each step: 20 + 10 = 30.
7. Find the missing number in the sequence: 13, 20, ____, 34, 41.
27The sequence increases by 7 each step: 20 + 7 = 27.
8. Find the missing number in the sequence: 1, 11, ____, 31, 41.
21The sequence increases by 10 each step: 11 + 10 = 21.
9. Find the missing number in the sequence: 15, 23, ____, 39, 47.
31The sequence increases by 8 each step: 23 + 8 = 31.
10. Find the missing number in the sequence: 20, 28, ____, 44, 52.
36The sequence increases by 8 each step: 28 + 8 = 36.
11. Find the missing number in the sequence: 14, 17, ____, 23, 26.
20The sequence increases by 3 each step: 17 + 3 = 20.
12. Find the missing number in the sequence: 14, 24, ____, 44, 54.
34The sequence increases by 10 each step: 24 + 10 = 34.
12 questions · Seed 64 · Age guidance, not curriculum certification