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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: 18, 23, ____, 33, 38.
2. Find the missing number in the sequence: 12, 13, ____, 15, 16.
3. Find the missing number in the sequence: 16, 18, ____, 22, 24.
4. Find the missing number in the sequence: 17, 18, ____, 20, 21.
5. Find the missing number in the sequence: 9, 14, ____, 24, 29.
6. Find the missing number in the sequence: 18, 19, ____, 21, 22.
7. Find the missing number in the sequence: 6, 7, ____, 9, 10.
8. Find the missing number in the sequence: 9, 11, ____, 15, 17.
9. Find the missing number in the sequence: 19, 20, ____, 22, 23.
10. Find the missing number in the sequence: 2, 4, ____, 8, 10.
11. Find the missing number in the sequence: 9, 10, ____, 12, 13.
12. Find the missing number in the sequence: 12, 14, ____, 18, 20.
12 questions · Seed 96 · 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: 18, 23, ____, 33, 38.
28The sequence increases by 5 each step: 23 + 5 = 28.
2. Find the missing number in the sequence: 12, 13, ____, 15, 16.
14The sequence increases by 1 each step: 13 + 1 = 14.
3. Find the missing number in the sequence: 16, 18, ____, 22, 24.
20The sequence increases by 2 each step: 18 + 2 = 20.
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: 9, 14, ____, 24, 29.
19The sequence increases by 5 each step: 14 + 5 = 19.
6. Find the missing number in the sequence: 18, 19, ____, 21, 22.
20The sequence increases by 1 each step: 19 + 1 = 20.
7. Find the missing number in the sequence: 6, 7, ____, 9, 10.
8The sequence increases by 1 each step: 7 + 1 = 8.
8. Find the missing number in the sequence: 9, 11, ____, 15, 17.
13The sequence increases by 2 each step: 11 + 2 = 13.
9. Find the missing number in the sequence: 19, 20, ____, 22, 23.
21The sequence increases by 1 each step: 20 + 1 = 21.
10. Find the missing number in the sequence: 2, 4, ____, 8, 10.
6The sequence increases by 2 each step: 4 + 2 = 6.
11. Find the missing number in the sequence: 9, 10, ____, 12, 13.
11The sequence increases by 1 each step: 10 + 1 = 11.
12. Find the missing number in the sequence: 12, 14, ____, 18, 20.
16The sequence increases by 2 each step: 14 + 2 = 16.
12 questions · Seed 96 · 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: 18, 23, ____, 33, 38.
2. Find the missing number in the sequence: 12, 13, ____, 15, 16.
3. Find the missing number in the sequence: 16, 18, ____, 22, 24.
4. Find the missing number in the sequence: 17, 18, ____, 20, 21.
5. Find the missing number in the sequence: 9, 14, ____, 24, 29.
6. Find the missing number in the sequence: 18, 19, ____, 21, 22.
7. Find the missing number in the sequence: 6, 7, ____, 9, 10.
8. Find the missing number in the sequence: 9, 11, ____, 15, 17.
9. Find the missing number in the sequence: 19, 20, ____, 22, 23.
10. Find the missing number in the sequence: 2, 4, ____, 8, 10.
11. Find the missing number in the sequence: 9, 10, ____, 12, 13.
12. Find the missing number in the sequence: 12, 14, ____, 18, 20.
12 questions · Seed 96 · 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: 18, 23, ____, 33, 38.
28The sequence increases by 5 each step: 23 + 5 = 28.
2. Find the missing number in the sequence: 12, 13, ____, 15, 16.
14The sequence increases by 1 each step: 13 + 1 = 14.
3. Find the missing number in the sequence: 16, 18, ____, 22, 24.
20The sequence increases by 2 each step: 18 + 2 = 20.
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: 9, 14, ____, 24, 29.
19The sequence increases by 5 each step: 14 + 5 = 19.
6. Find the missing number in the sequence: 18, 19, ____, 21, 22.
20The sequence increases by 1 each step: 19 + 1 = 20.
7. Find the missing number in the sequence: 6, 7, ____, 9, 10.
8The sequence increases by 1 each step: 7 + 1 = 8.
8. Find the missing number in the sequence: 9, 11, ____, 15, 17.
13The sequence increases by 2 each step: 11 + 2 = 13.
9. Find the missing number in the sequence: 19, 20, ____, 22, 23.
21The sequence increases by 1 each step: 20 + 1 = 21.
10. Find the missing number in the sequence: 2, 4, ____, 8, 10.
6The sequence increases by 2 each step: 4 + 2 = 6.
11. Find the missing number in the sequence: 9, 10, ____, 12, 13.
11The sequence increases by 1 each step: 10 + 1 = 11.
12. Find the missing number in the sequence: 12, 14, ____, 18, 20.
16The sequence increases by 2 each step: 14 + 2 = 16.
12 questions · Seed 96 · Age guidance, not curriculum certification