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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: 7, 17, ____, 37, 47.
2. Find the missing number in the sequence: 6, 16, ____, 36, 46.
3. Find the missing number in the sequence: 19, 28, ____, 46, 55.
4. Find the missing number in the sequence: 6, 15, ____, 33, 42.
5. Find the missing number in the sequence: 16, 25, ____, 43, 52.
6. Find the missing number in the sequence: 16, 24, ____, 40, 48.
7. Find the missing number in the sequence: 13, 22, ____, 40, 49.
8. Find the missing number in the sequence: 16, 26, ____, 46, 56.
9. Find the missing number in the sequence: 7, 10, ____, 16, 19.
10. Find the missing number in the sequence: 14, 18, ____, 26, 30.
11. Find the missing number in the sequence: 6, 9, ____, 15, 18.
12. Find the missing number in the sequence: 5, 12, ____, 26, 33.
12 questions · Seed 46 · 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: 7, 17, ____, 37, 47.
27The sequence increases by 10 each step: 17 + 10 = 27.
2. Find the missing number in the sequence: 6, 16, ____, 36, 46.
26The sequence increases by 10 each step: 16 + 10 = 26.
3. Find the missing number in the sequence: 19, 28, ____, 46, 55.
37The sequence increases by 9 each step: 28 + 9 = 37.
4. Find the missing number in the sequence: 6, 15, ____, 33, 42.
24The sequence increases by 9 each step: 15 + 9 = 24.
5. Find the missing number in the sequence: 16, 25, ____, 43, 52.
34The sequence increases by 9 each step: 25 + 9 = 34.
6. Find the missing number in the sequence: 16, 24, ____, 40, 48.
32The sequence increases by 8 each step: 24 + 8 = 32.
7. Find the missing number in the sequence: 13, 22, ____, 40, 49.
31The sequence increases by 9 each step: 22 + 9 = 31.
8. Find the missing number in the sequence: 16, 26, ____, 46, 56.
36The sequence increases by 10 each step: 26 + 10 = 36.
9. Find the missing number in the sequence: 7, 10, ____, 16, 19.
13The sequence increases by 3 each step: 10 + 3 = 13.
10. Find the missing number in the sequence: 14, 18, ____, 26, 30.
22The sequence increases by 4 each step: 18 + 4 = 22.
11. Find the missing number in the sequence: 6, 9, ____, 15, 18.
12The sequence increases by 3 each step: 9 + 3 = 12.
12. Find the missing number in the sequence: 5, 12, ____, 26, 33.
19The sequence increases by 7 each step: 12 + 7 = 19.
12 questions · Seed 46 · 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: 7, 17, ____, 37, 47.
2. Find the missing number in the sequence: 6, 16, ____, 36, 46.
3. Find the missing number in the sequence: 19, 28, ____, 46, 55.
4. Find the missing number in the sequence: 6, 15, ____, 33, 42.
5. Find the missing number in the sequence: 16, 25, ____, 43, 52.
6. Find the missing number in the sequence: 16, 24, ____, 40, 48.
7. Find the missing number in the sequence: 13, 22, ____, 40, 49.
8. Find the missing number in the sequence: 16, 26, ____, 46, 56.
9. Find the missing number in the sequence: 7, 10, ____, 16, 19.
10. Find the missing number in the sequence: 14, 18, ____, 26, 30.
11. Find the missing number in the sequence: 6, 9, ____, 15, 18.
12. Find the missing number in the sequence: 5, 12, ____, 26, 33.
12 questions · Seed 46 · 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: 7, 17, ____, 37, 47.
27The sequence increases by 10 each step: 17 + 10 = 27.
2. Find the missing number in the sequence: 6, 16, ____, 36, 46.
26The sequence increases by 10 each step: 16 + 10 = 26.
3. Find the missing number in the sequence: 19, 28, ____, 46, 55.
37The sequence increases by 9 each step: 28 + 9 = 37.
4. Find the missing number in the sequence: 6, 15, ____, 33, 42.
24The sequence increases by 9 each step: 15 + 9 = 24.
5. Find the missing number in the sequence: 16, 25, ____, 43, 52.
34The sequence increases by 9 each step: 25 + 9 = 34.
6. Find the missing number in the sequence: 16, 24, ____, 40, 48.
32The sequence increases by 8 each step: 24 + 8 = 32.
7. Find the missing number in the sequence: 13, 22, ____, 40, 49.
31The sequence increases by 9 each step: 22 + 9 = 31.
8. Find the missing number in the sequence: 16, 26, ____, 46, 56.
36The sequence increases by 10 each step: 26 + 10 = 36.
9. Find the missing number in the sequence: 7, 10, ____, 16, 19.
13The sequence increases by 3 each step: 10 + 3 = 13.
10. Find the missing number in the sequence: 14, 18, ____, 26, 30.
22The sequence increases by 4 each step: 18 + 4 = 22.
11. Find the missing number in the sequence: 6, 9, ____, 15, 18.
12The sequence increases by 3 each step: 9 + 3 = 12.
12. Find the missing number in the sequence: 5, 12, ____, 26, 33.
19The sequence increases by 7 each step: 12 + 7 = 19.
12 questions · Seed 46 · Age guidance, not curriculum certification