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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 4-6
Missing sequence terms
Take your time. Show your thinking.
1. Find the missing number in the sequence: 4, 9, ____, 19, 24.
2. Find the missing number in the sequence: 18, 23, ____, 33, 38.
3. Find the missing number in the sequence: 11, 13, ____, 17, 19.
4. Find the missing number in the sequence: 17, 18, ____, 20, 21.
5. Find the missing number in the sequence: 5, 6, ____, 8, 9.
6. Find the missing number in the sequence: 16, 18, ____, 22, 24.
7. Find the missing number in the sequence: 10, 11, ____, 13, 14.
8. Find the missing number in the sequence: 11, 16, ____, 26, 31.
9. Find the missing number in the sequence: 12, 13, ____, 15, 16.
10. Find the missing number in the sequence: 17, 19, ____, 23, 25.
11. Find the missing number in the sequence: 10, 12, ____, 16, 18.
12. Find the missing number in the sequence: 6, 7, ____, 9, 10.
12 questions · Seed 69 · Age guidance, not curriculum certification
View the answer key
Worksheet StudioAnswer key · Ages 4-6
Missing sequence terms
Answers and reasoning. Review before teaching.
1. Find the missing number in the sequence: 4, 9, ____, 19, 24.
14The sequence increases by 5 each step: 9 + 5 = 14.
2. Find the missing number in the sequence: 18, 23, ____, 33, 38.
28The sequence increases by 5 each step: 23 + 5 = 28.
3. Find the missing number in the sequence: 11, 13, ____, 17, 19.
15The sequence increases by 2 each step: 13 + 2 = 15.
4. Find the missing number in the sequence: 17, 18, ____, 20, 21.
19The sequence increases by 1 each step: 18 + 1 = 19.
5. Find the missing number in the sequence: 5, 6, ____, 8, 9.
7The sequence increases by 1 each step: 6 + 1 = 7.
6. Find the missing number in the sequence: 16, 18, ____, 22, 24.
20The sequence increases by 2 each step: 18 + 2 = 20.
7. Find the missing number in the sequence: 10, 11, ____, 13, 14.
12The sequence increases by 1 each step: 11 + 1 = 12.
8. Find the missing number in the sequence: 11, 16, ____, 26, 31.
21The sequence increases by 5 each step: 16 + 5 = 21.
9. Find the missing number in the sequence: 12, 13, ____, 15, 16.
14The sequence increases by 1 each step: 13 + 1 = 14.
10. Find the missing number in the sequence: 17, 19, ____, 23, 25.
21The sequence increases by 2 each step: 19 + 2 = 21.
11. Find the missing number in the sequence: 10, 12, ____, 16, 18.
14The sequence increases by 2 each step: 12 + 2 = 14.
12. Find the missing number in the sequence: 6, 7, ____, 9, 10.
8The sequence increases by 1 each step: 7 + 1 = 8.
12 questions · Seed 69 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 4-6
Missing sequence terms
Take your time. Show your thinking.
1. Find the missing number in the sequence: 4, 9, ____, 19, 24.
2. Find the missing number in the sequence: 18, 23, ____, 33, 38.
3. Find the missing number in the sequence: 11, 13, ____, 17, 19.
4. Find the missing number in the sequence: 17, 18, ____, 20, 21.
5. Find the missing number in the sequence: 5, 6, ____, 8, 9.
6. Find the missing number in the sequence: 16, 18, ____, 22, 24.
7. Find the missing number in the sequence: 10, 11, ____, 13, 14.
8. Find the missing number in the sequence: 11, 16, ____, 26, 31.
9. Find the missing number in the sequence: 12, 13, ____, 15, 16.
10. Find the missing number in the sequence: 17, 19, ____, 23, 25.
11. Find the missing number in the sequence: 10, 12, ____, 16, 18.
12. Find the missing number in the sequence: 6, 7, ____, 9, 10.
12 questions · Seed 69 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 4-6
Missing sequence terms
Answers and reasoning. Review before teaching.
1. Find the missing number in the sequence: 4, 9, ____, 19, 24.
14The sequence increases by 5 each step: 9 + 5 = 14.
2. Find the missing number in the sequence: 18, 23, ____, 33, 38.
28The sequence increases by 5 each step: 23 + 5 = 28.
3. Find the missing number in the sequence: 11, 13, ____, 17, 19.
15The sequence increases by 2 each step: 13 + 2 = 15.
4. Find the missing number in the sequence: 17, 18, ____, 20, 21.
19The sequence increases by 1 each step: 18 + 1 = 19.
5. Find the missing number in the sequence: 5, 6, ____, 8, 9.
7The sequence increases by 1 each step: 6 + 1 = 7.
6. Find the missing number in the sequence: 16, 18, ____, 22, 24.
20The sequence increases by 2 each step: 18 + 2 = 20.
7. Find the missing number in the sequence: 10, 11, ____, 13, 14.
12The sequence increases by 1 each step: 11 + 1 = 12.
8. Find the missing number in the sequence: 11, 16, ____, 26, 31.
21The sequence increases by 5 each step: 16 + 5 = 21.
9. Find the missing number in the sequence: 12, 13, ____, 15, 16.
14The sequence increases by 1 each step: 13 + 1 = 14.
10. Find the missing number in the sequence: 17, 19, ____, 23, 25.
21The sequence increases by 2 each step: 19 + 2 = 21.
11. Find the missing number in the sequence: 10, 12, ____, 16, 18.
14The sequence increases by 2 each step: 12 + 2 = 14.
12. Find the missing number in the sequence: 6, 7, ____, 9, 10.
8The sequence increases by 1 each step: 7 + 1 = 8.
12 questions · Seed 69 · Age guidance, not curriculum certification