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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: 17, 26, ____, 44, 53.
2. Find the missing number in the sequence: 10, 13, ____, 19, 22.
3. Find the missing number in the sequence: 14, 20, ____, 32, 38.
4. Find the missing number in the sequence: 9, 16, ____, 30, 37.
5. Find the missing number in the sequence: 1, 8, ____, 22, 29.
6. Find the missing number in the sequence: 10, 19, ____, 37, 46.
7. Find the missing number in the sequence: 14, 24, ____, 44, 54.
8. Find the missing number in the sequence: 11, 21, ____, 41, 51.
9. Find the missing number in the sequence: 15, 18, ____, 24, 27.
10. Find the missing number in the sequence: 6, 16, ____, 36, 46.
11. Find the missing number in the sequence: 8, 17, ____, 35, 44.
12. Find the missing number in the sequence: 20, 23, ____, 29, 32.
12 questions · Seed 43 · 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: 17, 26, ____, 44, 53.
35The sequence increases by 9 each step: 26 + 9 = 35.
2. Find the missing number in the sequence: 10, 13, ____, 19, 22.
16The sequence increases by 3 each step: 13 + 3 = 16.
3. Find the missing number in the sequence: 14, 20, ____, 32, 38.
26The sequence increases by 6 each step: 20 + 6 = 26.
4. Find the missing number in the sequence: 9, 16, ____, 30, 37.
23The sequence increases by 7 each step: 16 + 7 = 23.
5. Find the missing number in the sequence: 1, 8, ____, 22, 29.
15The sequence increases by 7 each step: 8 + 7 = 15.
6. Find the missing number in the sequence: 10, 19, ____, 37, 46.
28The sequence increases by 9 each step: 19 + 9 = 28.
7. Find the missing number in the sequence: 14, 24, ____, 44, 54.
34The sequence increases by 10 each step: 24 + 10 = 34.
8. Find the missing number in the sequence: 11, 21, ____, 41, 51.
31The sequence increases by 10 each step: 21 + 10 = 31.
9. Find the missing number in the sequence: 15, 18, ____, 24, 27.
21The sequence increases by 3 each step: 18 + 3 = 21.
10. Find the missing number in the sequence: 6, 16, ____, 36, 46.
26The sequence increases by 10 each step: 16 + 10 = 26.
11. Find the missing number in the sequence: 8, 17, ____, 35, 44.
26The sequence increases by 9 each step: 17 + 9 = 26.
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 43 · 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: 17, 26, ____, 44, 53.
2. Find the missing number in the sequence: 10, 13, ____, 19, 22.
3. Find the missing number in the sequence: 14, 20, ____, 32, 38.
4. Find the missing number in the sequence: 9, 16, ____, 30, 37.
5. Find the missing number in the sequence: 1, 8, ____, 22, 29.
6. Find the missing number in the sequence: 10, 19, ____, 37, 46.
7. Find the missing number in the sequence: 14, 24, ____, 44, 54.
8. Find the missing number in the sequence: 11, 21, ____, 41, 51.
9. Find the missing number in the sequence: 15, 18, ____, 24, 27.
10. Find the missing number in the sequence: 6, 16, ____, 36, 46.
11. Find the missing number in the sequence: 8, 17, ____, 35, 44.
12. Find the missing number in the sequence: 20, 23, ____, 29, 32.
12 questions · Seed 43 · 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: 17, 26, ____, 44, 53.
35The sequence increases by 9 each step: 26 + 9 = 35.
2. Find the missing number in the sequence: 10, 13, ____, 19, 22.
16The sequence increases by 3 each step: 13 + 3 = 16.
3. Find the missing number in the sequence: 14, 20, ____, 32, 38.
26The sequence increases by 6 each step: 20 + 6 = 26.
4. Find the missing number in the sequence: 9, 16, ____, 30, 37.
23The sequence increases by 7 each step: 16 + 7 = 23.
5. Find the missing number in the sequence: 1, 8, ____, 22, 29.
15The sequence increases by 7 each step: 8 + 7 = 15.
6. Find the missing number in the sequence: 10, 19, ____, 37, 46.
28The sequence increases by 9 each step: 19 + 9 = 28.
7. Find the missing number in the sequence: 14, 24, ____, 44, 54.
34The sequence increases by 10 each step: 24 + 10 = 34.
8. Find the missing number in the sequence: 11, 21, ____, 41, 51.
31The sequence increases by 10 each step: 21 + 10 = 31.
9. Find the missing number in the sequence: 15, 18, ____, 24, 27.
21The sequence increases by 3 each step: 18 + 3 = 21.
10. Find the missing number in the sequence: 6, 16, ____, 36, 46.
26The sequence increases by 10 each step: 16 + 10 = 26.
11. Find the missing number in the sequence: 8, 17, ____, 35, 44.
26The sequence increases by 9 each step: 17 + 9 = 26.
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 43 · Age guidance, not curriculum certification