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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: 6, 10, ____, 18, 22.
2. Find the missing number in the sequence: 13, 21, ____, 37, 45.
3. Find the missing number in the sequence: 3, 7, ____, 15, 19.
4. Find the missing number in the sequence: 10, 18, ____, 34, 42.
5. Find the missing number in the sequence: 17, 23, ____, 35, 41.
6. Find the missing number in the sequence: 4, 7, ____, 13, 16.
7. Find the missing number in the sequence: 1, 8, ____, 22, 29.
8. Find the missing number in the sequence: 13, 22, ____, 40, 49.
9. Find the missing number in the sequence: 11, 18, ____, 32, 39.
10. Find the missing number in the sequence: 9, 13, ____, 21, 25.
11. Find the missing number in the sequence: 12, 18, ____, 30, 36.
12. Find the missing number in the sequence: 14, 20, ____, 32, 38.
12 questions · Seed 98 · 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: 6, 10, ____, 18, 22.
14The sequence increases by 4 each step: 10 + 4 = 14.
2. Find the missing number in the sequence: 13, 21, ____, 37, 45.
29The sequence increases by 8 each step: 21 + 8 = 29.
3. Find the missing number in the sequence: 3, 7, ____, 15, 19.
11The sequence increases by 4 each step: 7 + 4 = 11.
4. Find the missing number in the sequence: 10, 18, ____, 34, 42.
26The sequence increases by 8 each step: 18 + 8 = 26.
5. Find the missing number in the sequence: 17, 23, ____, 35, 41.
29The sequence increases by 6 each step: 23 + 6 = 29.
6. Find the missing number in the sequence: 4, 7, ____, 13, 16.
10The sequence increases by 3 each step: 7 + 3 = 10.
7. Find the missing number in the sequence: 1, 8, ____, 22, 29.
15The sequence increases by 7 each step: 8 + 7 = 15.
8. Find the missing number in the sequence: 13, 22, ____, 40, 49.
31The sequence increases by 9 each step: 22 + 9 = 31.
9. Find the missing number in the sequence: 11, 18, ____, 32, 39.
25The sequence increases by 7 each step: 18 + 7 = 25.
10. Find the missing number in the sequence: 9, 13, ____, 21, 25.
17The sequence increases by 4 each step: 13 + 4 = 17.
11. Find the missing number in the sequence: 12, 18, ____, 30, 36.
24The sequence increases by 6 each step: 18 + 6 = 24.
12. Find the missing number in the sequence: 14, 20, ____, 32, 38.
26The sequence increases by 6 each step: 20 + 6 = 26.
12 questions · Seed 98 · 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: 6, 10, ____, 18, 22.
2. Find the missing number in the sequence: 13, 21, ____, 37, 45.
3. Find the missing number in the sequence: 3, 7, ____, 15, 19.
4. Find the missing number in the sequence: 10, 18, ____, 34, 42.
5. Find the missing number in the sequence: 17, 23, ____, 35, 41.
6. Find the missing number in the sequence: 4, 7, ____, 13, 16.
7. Find the missing number in the sequence: 1, 8, ____, 22, 29.
8. Find the missing number in the sequence: 13, 22, ____, 40, 49.
9. Find the missing number in the sequence: 11, 18, ____, 32, 39.
10. Find the missing number in the sequence: 9, 13, ____, 21, 25.
11. Find the missing number in the sequence: 12, 18, ____, 30, 36.
12. Find the missing number in the sequence: 14, 20, ____, 32, 38.
12 questions · Seed 98 · 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: 6, 10, ____, 18, 22.
14The sequence increases by 4 each step: 10 + 4 = 14.
2. Find the missing number in the sequence: 13, 21, ____, 37, 45.
29The sequence increases by 8 each step: 21 + 8 = 29.
3. Find the missing number in the sequence: 3, 7, ____, 15, 19.
11The sequence increases by 4 each step: 7 + 4 = 11.
4. Find the missing number in the sequence: 10, 18, ____, 34, 42.
26The sequence increases by 8 each step: 18 + 8 = 26.
5. Find the missing number in the sequence: 17, 23, ____, 35, 41.
29The sequence increases by 6 each step: 23 + 6 = 29.
6. Find the missing number in the sequence: 4, 7, ____, 13, 16.
10The sequence increases by 3 each step: 7 + 3 = 10.
7. Find the missing number in the sequence: 1, 8, ____, 22, 29.
15The sequence increases by 7 each step: 8 + 7 = 15.
8. Find the missing number in the sequence: 13, 22, ____, 40, 49.
31The sequence increases by 9 each step: 22 + 9 = 31.
9. Find the missing number in the sequence: 11, 18, ____, 32, 39.
25The sequence increases by 7 each step: 18 + 7 = 25.
10. Find the missing number in the sequence: 9, 13, ____, 21, 25.
17The sequence increases by 4 each step: 13 + 4 = 17.
11. Find the missing number in the sequence: 12, 18, ____, 30, 36.
24The sequence increases by 6 each step: 18 + 6 = 24.
12. Find the missing number in the sequence: 14, 20, ____, 32, 38.
26The sequence increases by 6 each step: 20 + 6 = 26.
12 questions · Seed 98 · Age guidance, not curriculum certification