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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: 9, 10, ____, 12, 13.
2. Find the missing number in the sequence: 18, 23, ____, 33, 38.
3. Find the missing number in the sequence: 14, 19, ____, 29, 34.
4. Find the missing number in the sequence: 10, 11, ____, 13, 14.
5. Find the missing number in the sequence: 7, 9, ____, 13, 15.
6. Find the missing number in the sequence: 19, 24, ____, 34, 39.
7. Find the missing number in the sequence: 18, 19, ____, 21, 22.
8. Find the missing number in the sequence: 11, 13, ____, 17, 19.
9. Find the missing number in the sequence: 7, 12, ____, 22, 27.
10. Find the missing number in the sequence: 19, 21, ____, 25, 27.
11. Find the missing number in the sequence: 10, 12, ____, 16, 18.
12. Find the missing number in the sequence: 4, 6, ____, 10, 12.
12 questions · Seed 85 · 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: 9, 10, ____, 12, 13.
11The sequence increases by 1 each step: 10 + 1 = 11.
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: 14, 19, ____, 29, 34.
24The sequence increases by 5 each step: 19 + 5 = 24.
4. Find the missing number in the sequence: 10, 11, ____, 13, 14.
12The sequence increases by 1 each step: 11 + 1 = 12.
5. Find the missing number in the sequence: 7, 9, ____, 13, 15.
11The sequence increases by 2 each step: 9 + 2 = 11.
6. Find the missing number in the sequence: 19, 24, ____, 34, 39.
29The sequence increases by 5 each step: 24 + 5 = 29.
7. Find the missing number in the sequence: 18, 19, ____, 21, 22.
20The sequence increases by 1 each step: 19 + 1 = 20.
8. Find the missing number in the sequence: 11, 13, ____, 17, 19.
15The sequence increases by 2 each step: 13 + 2 = 15.
9. Find the missing number in the sequence: 7, 12, ____, 22, 27.
17The sequence increases by 5 each step: 12 + 5 = 17.
10. Find the missing number in the sequence: 19, 21, ____, 25, 27.
23The sequence increases by 2 each step: 21 + 2 = 23.
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: 4, 6, ____, 10, 12.
8The sequence increases by 2 each step: 6 + 2 = 8.
12 questions · Seed 85 · 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: 9, 10, ____, 12, 13.
2. Find the missing number in the sequence: 18, 23, ____, 33, 38.
3. Find the missing number in the sequence: 14, 19, ____, 29, 34.
4. Find the missing number in the sequence: 10, 11, ____, 13, 14.
5. Find the missing number in the sequence: 7, 9, ____, 13, 15.
6. Find the missing number in the sequence: 19, 24, ____, 34, 39.
7. Find the missing number in the sequence: 18, 19, ____, 21, 22.
8. Find the missing number in the sequence: 11, 13, ____, 17, 19.
9. Find the missing number in the sequence: 7, 12, ____, 22, 27.
10. Find the missing number in the sequence: 19, 21, ____, 25, 27.
11. Find the missing number in the sequence: 10, 12, ____, 16, 18.
12. Find the missing number in the sequence: 4, 6, ____, 10, 12.
12 questions · Seed 85 · 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: 9, 10, ____, 12, 13.
11The sequence increases by 1 each step: 10 + 1 = 11.
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: 14, 19, ____, 29, 34.
24The sequence increases by 5 each step: 19 + 5 = 24.
4. Find the missing number in the sequence: 10, 11, ____, 13, 14.
12The sequence increases by 1 each step: 11 + 1 = 12.
5. Find the missing number in the sequence: 7, 9, ____, 13, 15.
11The sequence increases by 2 each step: 9 + 2 = 11.
6. Find the missing number in the sequence: 19, 24, ____, 34, 39.
29The sequence increases by 5 each step: 24 + 5 = 29.
7. Find the missing number in the sequence: 18, 19, ____, 21, 22.
20The sequence increases by 1 each step: 19 + 1 = 20.
8. Find the missing number in the sequence: 11, 13, ____, 17, 19.
15The sequence increases by 2 each step: 13 + 2 = 15.
9. Find the missing number in the sequence: 7, 12, ____, 22, 27.
17The sequence increases by 5 each step: 12 + 5 = 17.
10. Find the missing number in the sequence: 19, 21, ____, 25, 27.
23The sequence increases by 2 each step: 21 + 2 = 23.
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: 4, 6, ____, 10, 12.
8The sequence increases by 2 each step: 6 + 2 = 8.
12 questions · Seed 85 · Age guidance, not curriculum certification