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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, 11, ____, 15, 17.
2. Find the missing number in the sequence: 19, 21, ____, 25, 27.
3. Find the missing number in the sequence: 16, 18, ____, 22, 24.
4. Find the missing number in the sequence: 6, 8, ____, 12, 14.
5. Find the missing number in the sequence: 9, 10, ____, 12, 13.
6. Find the missing number in the sequence: 11, 13, ____, 17, 19.
7. Find the missing number in the sequence: 10, 11, ____, 13, 14.
8. Find the missing number in the sequence: 10, 15, ____, 25, 30.
9. Find the missing number in the sequence: 7, 8, ____, 10, 11.
10. Find the missing number in the sequence: 8, 9, ____, 11, 12.
11. Find the missing number in the sequence: 17, 22, ____, 32, 37.
12. Find the missing number in the sequence: 8, 13, ____, 23, 28.
12 questions · Seed 61 · 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, 11, ____, 15, 17.
13The sequence increases by 2 each step: 11 + 2 = 13.
2. Find the missing number in the sequence: 19, 21, ____, 25, 27.
23The sequence increases by 2 each step: 21 + 2 = 23.
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: 6, 8, ____, 12, 14.
10The sequence increases by 2 each step: 8 + 2 = 10.
5. Find the missing number in the sequence: 9, 10, ____, 12, 13.
11The sequence increases by 1 each step: 10 + 1 = 11.
6. Find the missing number in the sequence: 11, 13, ____, 17, 19.
15The sequence increases by 2 each step: 13 + 2 = 15.
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: 10, 15, ____, 25, 30.
20The sequence increases by 5 each step: 15 + 5 = 20.
9. Find the missing number in the sequence: 7, 8, ____, 10, 11.
9The sequence increases by 1 each step: 8 + 1 = 9.
10. Find the missing number in the sequence: 8, 9, ____, 11, 12.
10The sequence increases by 1 each step: 9 + 1 = 10.
11. Find the missing number in the sequence: 17, 22, ____, 32, 37.
27The sequence increases by 5 each step: 22 + 5 = 27.
12. Find the missing number in the sequence: 8, 13, ____, 23, 28.
18The sequence increases by 5 each step: 13 + 5 = 18.
12 questions · Seed 61 · 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, 11, ____, 15, 17.
2. Find the missing number in the sequence: 19, 21, ____, 25, 27.
3. Find the missing number in the sequence: 16, 18, ____, 22, 24.
4. Find the missing number in the sequence: 6, 8, ____, 12, 14.
5. Find the missing number in the sequence: 9, 10, ____, 12, 13.
6. Find the missing number in the sequence: 11, 13, ____, 17, 19.
7. Find the missing number in the sequence: 10, 11, ____, 13, 14.
8. Find the missing number in the sequence: 10, 15, ____, 25, 30.
9. Find the missing number in the sequence: 7, 8, ____, 10, 11.
10. Find the missing number in the sequence: 8, 9, ____, 11, 12.
11. Find the missing number in the sequence: 17, 22, ____, 32, 37.
12. Find the missing number in the sequence: 8, 13, ____, 23, 28.
12 questions · Seed 61 · 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, 11, ____, 15, 17.
13The sequence increases by 2 each step: 11 + 2 = 13.
2. Find the missing number in the sequence: 19, 21, ____, 25, 27.
23The sequence increases by 2 each step: 21 + 2 = 23.
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: 6, 8, ____, 12, 14.
10The sequence increases by 2 each step: 8 + 2 = 10.
5. Find the missing number in the sequence: 9, 10, ____, 12, 13.
11The sequence increases by 1 each step: 10 + 1 = 11.
6. Find the missing number in the sequence: 11, 13, ____, 17, 19.
15The sequence increases by 2 each step: 13 + 2 = 15.
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: 10, 15, ____, 25, 30.
20The sequence increases by 5 each step: 15 + 5 = 20.
9. Find the missing number in the sequence: 7, 8, ____, 10, 11.
9The sequence increases by 1 each step: 8 + 1 = 9.
10. Find the missing number in the sequence: 8, 9, ____, 11, 12.
10The sequence increases by 1 each step: 9 + 1 = 10.
11. Find the missing number in the sequence: 17, 22, ____, 32, 37.
27The sequence increases by 5 each step: 22 + 5 = 27.
12. Find the missing number in the sequence: 8, 13, ____, 23, 28.
18The sequence increases by 5 each step: 13 + 5 = 18.
12 questions · Seed 61 · Age guidance, not curriculum certification