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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, 11, ____, 25, 32.
2. Find the missing number in the sequence: 20, 23, ____, 29, 32.
3. Find the missing number in the sequence: 6, 12, ____, 24, 30.
4. Find the missing number in the sequence: 10, 13, ____, 19, 22.
5. Find the missing number in the sequence: 4, 7, ____, 13, 16.
6. Find the missing number in the sequence: 9, 12, ____, 18, 21.
7. Find the missing number in the sequence: 4, 8, ____, 16, 20.
8. Find the missing number in the sequence: 18, 27, ____, 45, 54.
9. Find the missing number in the sequence: 11, 17, ____, 29, 35.
10. Find the missing number in the sequence: 15, 21, ____, 33, 39.
11. Find the missing number in the sequence: 1, 8, ____, 22, 29.
12. Find the missing number in the sequence: 2, 6, ____, 14, 18.
12 questions · Seed 83 · 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, 11, ____, 25, 32.
18The sequence increases by 7 each step: 11 + 7 = 18.
2. Find the missing number in the sequence: 20, 23, ____, 29, 32.
26The sequence increases by 3 each step: 23 + 3 = 26.
3. Find the missing number in the sequence: 6, 12, ____, 24, 30.
18The sequence increases by 6 each step: 12 + 6 = 18.
4. Find the missing number in the sequence: 10, 13, ____, 19, 22.
16The sequence increases by 3 each step: 13 + 3 = 16.
5. Find the missing number in the sequence: 4, 7, ____, 13, 16.
10The sequence increases by 3 each step: 7 + 3 = 10.
6. Find the missing number in the sequence: 9, 12, ____, 18, 21.
15The sequence increases by 3 each step: 12 + 3 = 15.
7. Find the missing number in the sequence: 4, 8, ____, 16, 20.
12The sequence increases by 4 each step: 8 + 4 = 12.
8. Find the missing number in the sequence: 18, 27, ____, 45, 54.
36The sequence increases by 9 each step: 27 + 9 = 36.
9. Find the missing number in the sequence: 11, 17, ____, 29, 35.
23The sequence increases by 6 each step: 17 + 6 = 23.
10. Find the missing number in the sequence: 15, 21, ____, 33, 39.
27The sequence increases by 6 each step: 21 + 6 = 27.
11. Find the missing number in the sequence: 1, 8, ____, 22, 29.
15The sequence increases by 7 each step: 8 + 7 = 15.
12. Find the missing number in the sequence: 2, 6, ____, 14, 18.
10The sequence increases by 4 each step: 6 + 4 = 10.
12 questions · Seed 83 · 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, 11, ____, 25, 32.
2. Find the missing number in the sequence: 20, 23, ____, 29, 32.
3. Find the missing number in the sequence: 6, 12, ____, 24, 30.
4. Find the missing number in the sequence: 10, 13, ____, 19, 22.
5. Find the missing number in the sequence: 4, 7, ____, 13, 16.
6. Find the missing number in the sequence: 9, 12, ____, 18, 21.
7. Find the missing number in the sequence: 4, 8, ____, 16, 20.
8. Find the missing number in the sequence: 18, 27, ____, 45, 54.
9. Find the missing number in the sequence: 11, 17, ____, 29, 35.
10. Find the missing number in the sequence: 15, 21, ____, 33, 39.
11. Find the missing number in the sequence: 1, 8, ____, 22, 29.
12. Find the missing number in the sequence: 2, 6, ____, 14, 18.
12 questions · Seed 83 · 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, 11, ____, 25, 32.
18The sequence increases by 7 each step: 11 + 7 = 18.
2. Find the missing number in the sequence: 20, 23, ____, 29, 32.
26The sequence increases by 3 each step: 23 + 3 = 26.
3. Find the missing number in the sequence: 6, 12, ____, 24, 30.
18The sequence increases by 6 each step: 12 + 6 = 18.
4. Find the missing number in the sequence: 10, 13, ____, 19, 22.
16The sequence increases by 3 each step: 13 + 3 = 16.
5. Find the missing number in the sequence: 4, 7, ____, 13, 16.
10The sequence increases by 3 each step: 7 + 3 = 10.
6. Find the missing number in the sequence: 9, 12, ____, 18, 21.
15The sequence increases by 3 each step: 12 + 3 = 15.
7. Find the missing number in the sequence: 4, 8, ____, 16, 20.
12The sequence increases by 4 each step: 8 + 4 = 12.
8. Find the missing number in the sequence: 18, 27, ____, 45, 54.
36The sequence increases by 9 each step: 27 + 9 = 36.
9. Find the missing number in the sequence: 11, 17, ____, 29, 35.
23The sequence increases by 6 each step: 17 + 6 = 23.
10. Find the missing number in the sequence: 15, 21, ____, 33, 39.
27The sequence increases by 6 each step: 21 + 6 = 27.
11. Find the missing number in the sequence: 1, 8, ____, 22, 29.
15The sequence increases by 7 each step: 8 + 7 = 15.
12. Find the missing number in the sequence: 2, 6, ____, 14, 18.
10The sequence increases by 4 each step: 6 + 4 = 10.
12 questions · Seed 83 · Age guidance, not curriculum certification