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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: 14, 20, ____, 32, 38.
2. Find the missing number in the sequence: 10, 14, ____, 22, 26.
3. Find the missing number in the sequence: 4, 13, ____, 31, 40.
4. Find the missing number in the sequence: 7, 17, ____, 37, 47.
5. Find the missing number in the sequence: 6, 15, ____, 33, 42.
6. Find the missing number in the sequence: 20, 30, ____, 50, 60.
7. Find the missing number in the sequence: 16, 26, ____, 46, 56.
8. Find the missing number in the sequence: 7, 10, ____, 16, 19.
9. Find the missing number in the sequence: 16, 20, ____, 28, 32.
10. Find the missing number in the sequence: 12, 22, ____, 42, 52.
11. Find the missing number in the sequence: 13, 23, ____, 43, 53.
12. Find the missing number in the sequence: 6, 10, ____, 18, 22.
12 questions · Seed 81 · 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: 14, 20, ____, 32, 38.
26The sequence increases by 6 each step: 20 + 6 = 26.
2. Find the missing number in the sequence: 10, 14, ____, 22, 26.
18The sequence increases by 4 each step: 14 + 4 = 18.
3. Find the missing number in the sequence: 4, 13, ____, 31, 40.
22The sequence increases by 9 each step: 13 + 9 = 22.
4. Find the missing number in the sequence: 7, 17, ____, 37, 47.
27The sequence increases by 10 each step: 17 + 10 = 27.
5. Find the missing number in the sequence: 6, 15, ____, 33, 42.
24The sequence increases by 9 each step: 15 + 9 = 24.
6. Find the missing number in the sequence: 20, 30, ____, 50, 60.
40The sequence increases by 10 each step: 30 + 10 = 40.
7. Find the missing number in the sequence: 16, 26, ____, 46, 56.
36The sequence increases by 10 each step: 26 + 10 = 36.
8. Find the missing number in the sequence: 7, 10, ____, 16, 19.
13The sequence increases by 3 each step: 10 + 3 = 13.
9. Find the missing number in the sequence: 16, 20, ____, 28, 32.
24The sequence increases by 4 each step: 20 + 4 = 24.
10. Find the missing number in the sequence: 12, 22, ____, 42, 52.
32The sequence increases by 10 each step: 22 + 10 = 32.
11. Find the missing number in the sequence: 13, 23, ____, 43, 53.
33The sequence increases by 10 each step: 23 + 10 = 33.
12. Find the missing number in the sequence: 6, 10, ____, 18, 22.
14The sequence increases by 4 each step: 10 + 4 = 14.
12 questions · Seed 81 · 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: 14, 20, ____, 32, 38.
2. Find the missing number in the sequence: 10, 14, ____, 22, 26.
3. Find the missing number in the sequence: 4, 13, ____, 31, 40.
4. Find the missing number in the sequence: 7, 17, ____, 37, 47.
5. Find the missing number in the sequence: 6, 15, ____, 33, 42.
6. Find the missing number in the sequence: 20, 30, ____, 50, 60.
7. Find the missing number in the sequence: 16, 26, ____, 46, 56.
8. Find the missing number in the sequence: 7, 10, ____, 16, 19.
9. Find the missing number in the sequence: 16, 20, ____, 28, 32.
10. Find the missing number in the sequence: 12, 22, ____, 42, 52.
11. Find the missing number in the sequence: 13, 23, ____, 43, 53.
12. Find the missing number in the sequence: 6, 10, ____, 18, 22.
12 questions · Seed 81 · 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: 14, 20, ____, 32, 38.
26The sequence increases by 6 each step: 20 + 6 = 26.
2. Find the missing number in the sequence: 10, 14, ____, 22, 26.
18The sequence increases by 4 each step: 14 + 4 = 18.
3. Find the missing number in the sequence: 4, 13, ____, 31, 40.
22The sequence increases by 9 each step: 13 + 9 = 22.
4. Find the missing number in the sequence: 7, 17, ____, 37, 47.
27The sequence increases by 10 each step: 17 + 10 = 27.
5. Find the missing number in the sequence: 6, 15, ____, 33, 42.
24The sequence increases by 9 each step: 15 + 9 = 24.
6. Find the missing number in the sequence: 20, 30, ____, 50, 60.
40The sequence increases by 10 each step: 30 + 10 = 40.
7. Find the missing number in the sequence: 16, 26, ____, 46, 56.
36The sequence increases by 10 each step: 26 + 10 = 36.
8. Find the missing number in the sequence: 7, 10, ____, 16, 19.
13The sequence increases by 3 each step: 10 + 3 = 13.
9. Find the missing number in the sequence: 16, 20, ____, 28, 32.
24The sequence increases by 4 each step: 20 + 4 = 24.
10. Find the missing number in the sequence: 12, 22, ____, 42, 52.
32The sequence increases by 10 each step: 22 + 10 = 32.
11. Find the missing number in the sequence: 13, 23, ____, 43, 53.
33The sequence increases by 10 each step: 23 + 10 = 33.
12. Find the missing number in the sequence: 6, 10, ____, 18, 22.
14The sequence increases by 4 each step: 10 + 4 = 14.
12 questions · Seed 81 · Age guidance, not curriculum certification