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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: 4, 7, ____, 13, 16.
2. Find the missing number in the sequence: 11, 21, ____, 41, 51.
3. Find the missing number in the sequence: 14, 23, ____, 41, 50.
4. Find the missing number in the sequence: 17, 20, ____, 26, 29.
5. Find the missing number in the sequence: 5, 14, ____, 32, 41.
6. Find the missing number in the sequence: 20, 24, ____, 32, 36.
7. Find the missing number in the sequence: 10, 18, ____, 34, 42.
8. Find the missing number in the sequence: 8, 17, ____, 35, 44.
9. Find the missing number in the sequence: 5, 9, ____, 17, 21.
10. Find the missing number in the sequence: 18, 26, ____, 42, 50.
11. Find the missing number in the sequence: 10, 19, ____, 37, 46.
12. Find the missing number in the sequence: 13, 22, ____, 40, 49.
12 questions · Seed 62 · 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: 4, 7, ____, 13, 16.
10The sequence increases by 3 each step: 7 + 3 = 10.
2. Find the missing number in the sequence: 11, 21, ____, 41, 51.
31The sequence increases by 10 each step: 21 + 10 = 31.
3. Find the missing number in the sequence: 14, 23, ____, 41, 50.
32The sequence increases by 9 each step: 23 + 9 = 32.
4. Find the missing number in the sequence: 17, 20, ____, 26, 29.
23The sequence increases by 3 each step: 20 + 3 = 23.
5. Find the missing number in the sequence: 5, 14, ____, 32, 41.
23The sequence increases by 9 each step: 14 + 9 = 23.
6. Find the missing number in the sequence: 20, 24, ____, 32, 36.
28The sequence increases by 4 each step: 24 + 4 = 28.
7. Find the missing number in the sequence: 10, 18, ____, 34, 42.
26The sequence increases by 8 each step: 18 + 8 = 26.
8. Find the missing number in the sequence: 8, 17, ____, 35, 44.
26The sequence increases by 9 each step: 17 + 9 = 26.
9. Find the missing number in the sequence: 5, 9, ____, 17, 21.
13The sequence increases by 4 each step: 9 + 4 = 13.
10. Find the missing number in the sequence: 18, 26, ____, 42, 50.
34The sequence increases by 8 each step: 26 + 8 = 34.
11. Find the missing number in the sequence: 10, 19, ____, 37, 46.
28The sequence increases by 9 each step: 19 + 9 = 28.
12. Find the missing number in the sequence: 13, 22, ____, 40, 49.
31The sequence increases by 9 each step: 22 + 9 = 31.
12 questions · Seed 62 · 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: 4, 7, ____, 13, 16.
2. Find the missing number in the sequence: 11, 21, ____, 41, 51.
3. Find the missing number in the sequence: 14, 23, ____, 41, 50.
4. Find the missing number in the sequence: 17, 20, ____, 26, 29.
5. Find the missing number in the sequence: 5, 14, ____, 32, 41.
6. Find the missing number in the sequence: 20, 24, ____, 32, 36.
7. Find the missing number in the sequence: 10, 18, ____, 34, 42.
8. Find the missing number in the sequence: 8, 17, ____, 35, 44.
9. Find the missing number in the sequence: 5, 9, ____, 17, 21.
10. Find the missing number in the sequence: 18, 26, ____, 42, 50.
11. Find the missing number in the sequence: 10, 19, ____, 37, 46.
12. Find the missing number in the sequence: 13, 22, ____, 40, 49.
12 questions · Seed 62 · 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: 4, 7, ____, 13, 16.
10The sequence increases by 3 each step: 7 + 3 = 10.
2. Find the missing number in the sequence: 11, 21, ____, 41, 51.
31The sequence increases by 10 each step: 21 + 10 = 31.
3. Find the missing number in the sequence: 14, 23, ____, 41, 50.
32The sequence increases by 9 each step: 23 + 9 = 32.
4. Find the missing number in the sequence: 17, 20, ____, 26, 29.
23The sequence increases by 3 each step: 20 + 3 = 23.
5. Find the missing number in the sequence: 5, 14, ____, 32, 41.
23The sequence increases by 9 each step: 14 + 9 = 23.
6. Find the missing number in the sequence: 20, 24, ____, 32, 36.
28The sequence increases by 4 each step: 24 + 4 = 28.
7. Find the missing number in the sequence: 10, 18, ____, 34, 42.
26The sequence increases by 8 each step: 18 + 8 = 26.
8. Find the missing number in the sequence: 8, 17, ____, 35, 44.
26The sequence increases by 9 each step: 17 + 9 = 26.
9. Find the missing number in the sequence: 5, 9, ____, 17, 21.
13The sequence increases by 4 each step: 9 + 4 = 13.
10. Find the missing number in the sequence: 18, 26, ____, 42, 50.
34The sequence increases by 8 each step: 26 + 8 = 34.
11. Find the missing number in the sequence: 10, 19, ____, 37, 46.
28The sequence increases by 9 each step: 19 + 9 = 28.
12. Find the missing number in the sequence: 13, 22, ____, 40, 49.
31The sequence increases by 9 each step: 22 + 9 = 31.
12 questions · Seed 62 · Age guidance, not curriculum certification