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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: 5, 6, ____, 8, 9.
2. Find the missing number in the sequence: 15, 16, ____, 18, 19.
3. Find the missing number in the sequence: 15, 17, ____, 21, 23.
4. Find the missing number in the sequence: 11, 13, ____, 17, 19.
5. Find the missing number in the sequence: 5, 10, ____, 20, 25.
6. Find the missing number in the sequence: 4, 5, ____, 7, 8.
7. Find the missing number in the sequence: 12, 13, ____, 15, 16.
8. Find the missing number in the sequence: 10, 15, ____, 25, 30.
9. Find the missing number in the sequence: 7, 9, ____, 13, 15.
10. Find the missing number in the sequence: 16, 18, ____, 22, 24.
11. Find the missing number in the sequence: 6, 8, ____, 12, 14.
12. Find the missing number in the sequence: 17, 18, ____, 20, 21.
12 questions · Seed 74 · 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: 5, 6, ____, 8, 9.
7The sequence increases by 1 each step: 6 + 1 = 7.
2. Find the missing number in the sequence: 15, 16, ____, 18, 19.
17The sequence increases by 1 each step: 16 + 1 = 17.
3. Find the missing number in the sequence: 15, 17, ____, 21, 23.
19The sequence increases by 2 each step: 17 + 2 = 19.
4. Find the missing number in the sequence: 11, 13, ____, 17, 19.
15The sequence increases by 2 each step: 13 + 2 = 15.
5. Find the missing number in the sequence: 5, 10, ____, 20, 25.
15The sequence increases by 5 each step: 10 + 5 = 15.
6. Find the missing number in the sequence: 4, 5, ____, 7, 8.
6The sequence increases by 1 each step: 5 + 1 = 6.
7. Find the missing number in the sequence: 12, 13, ____, 15, 16.
14The sequence increases by 1 each step: 13 + 1 = 14.
8. Find the missing number in the sequence: 10, 15, ____, 25, 30.
20The sequence increases by 5 each step: 15 + 5 = 20.
9. Find the missing number in the sequence: 7, 9, ____, 13, 15.
11The sequence increases by 2 each step: 9 + 2 = 11.
10. Find the missing number in the sequence: 16, 18, ____, 22, 24.
20The sequence increases by 2 each step: 18 + 2 = 20.
11. Find the missing number in the sequence: 6, 8, ____, 12, 14.
10The sequence increases by 2 each step: 8 + 2 = 10.
12. Find the missing number in the sequence: 17, 18, ____, 20, 21.
19The sequence increases by 1 each step: 18 + 1 = 19.
12 questions · Seed 74 · 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: 5, 6, ____, 8, 9.
2. Find the missing number in the sequence: 15, 16, ____, 18, 19.
3. Find the missing number in the sequence: 15, 17, ____, 21, 23.
4. Find the missing number in the sequence: 11, 13, ____, 17, 19.
5. Find the missing number in the sequence: 5, 10, ____, 20, 25.
6. Find the missing number in the sequence: 4, 5, ____, 7, 8.
7. Find the missing number in the sequence: 12, 13, ____, 15, 16.
8. Find the missing number in the sequence: 10, 15, ____, 25, 30.
9. Find the missing number in the sequence: 7, 9, ____, 13, 15.
10. Find the missing number in the sequence: 16, 18, ____, 22, 24.
11. Find the missing number in the sequence: 6, 8, ____, 12, 14.
12. Find the missing number in the sequence: 17, 18, ____, 20, 21.
12 questions · Seed 74 · 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: 5, 6, ____, 8, 9.
7The sequence increases by 1 each step: 6 + 1 = 7.
2. Find the missing number in the sequence: 15, 16, ____, 18, 19.
17The sequence increases by 1 each step: 16 + 1 = 17.
3. Find the missing number in the sequence: 15, 17, ____, 21, 23.
19The sequence increases by 2 each step: 17 + 2 = 19.
4. Find the missing number in the sequence: 11, 13, ____, 17, 19.
15The sequence increases by 2 each step: 13 + 2 = 15.
5. Find the missing number in the sequence: 5, 10, ____, 20, 25.
15The sequence increases by 5 each step: 10 + 5 = 15.
6. Find the missing number in the sequence: 4, 5, ____, 7, 8.
6The sequence increases by 1 each step: 5 + 1 = 6.
7. Find the missing number in the sequence: 12, 13, ____, 15, 16.
14The sequence increases by 1 each step: 13 + 1 = 14.
8. Find the missing number in the sequence: 10, 15, ____, 25, 30.
20The sequence increases by 5 each step: 15 + 5 = 20.
9. Find the missing number in the sequence: 7, 9, ____, 13, 15.
11The sequence increases by 2 each step: 9 + 2 = 11.
10. Find the missing number in the sequence: 16, 18, ____, 22, 24.
20The sequence increases by 2 each step: 18 + 2 = 20.
11. Find the missing number in the sequence: 6, 8, ____, 12, 14.
10The sequence increases by 2 each step: 8 + 2 = 10.
12. Find the missing number in the sequence: 17, 18, ____, 20, 21.
19The sequence increases by 1 each step: 18 + 1 = 19.
12 questions · Seed 74 · Age guidance, not curriculum certification