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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: 10, 12, ____, 16, 18.
2. Find the missing number in the sequence: 9, 10, ____, 12, 13.
3. Find the missing number in the sequence: 5, 7, ____, 11, 13.
4. Find the missing number in the sequence: 2, 4, ____, 8, 10.
5. Find the missing number in the sequence: 2, 7, ____, 17, 22.
6. Find the missing number in the sequence: 7, 12, ____, 22, 27.
7. Find the missing number in the sequence: 4, 6, ____, 10, 12.
8. Find the missing number in the sequence: 16, 18, ____, 22, 24.
9. Find the missing number in the sequence: 8, 9, ____, 11, 12.
10. Find the missing number in the sequence: 16, 21, ____, 31, 36.
11. Find the missing number in the sequence: 8, 13, ____, 23, 28.
12. Find the missing number in the sequence: 12, 14, ____, 18, 20.
12 questions · Seed 77 · 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: 10, 12, ____, 16, 18.
14The sequence increases by 2 each step: 12 + 2 = 14.
2. Find the missing number in the sequence: 9, 10, ____, 12, 13.
11The sequence increases by 1 each step: 10 + 1 = 11.
3. Find the missing number in the sequence: 5, 7, ____, 11, 13.
9The sequence increases by 2 each step: 7 + 2 = 9.
4. Find the missing number in the sequence: 2, 4, ____, 8, 10.
6The sequence increases by 2 each step: 4 + 2 = 6.
5. Find the missing number in the sequence: 2, 7, ____, 17, 22.
12The sequence increases by 5 each step: 7 + 5 = 12.
6. Find the missing number in the sequence: 7, 12, ____, 22, 27.
17The sequence increases by 5 each step: 12 + 5 = 17.
7. Find the missing number in the sequence: 4, 6, ____, 10, 12.
8The sequence increases by 2 each step: 6 + 2 = 8.
8. Find the missing number in the sequence: 16, 18, ____, 22, 24.
20The sequence increases by 2 each step: 18 + 2 = 20.
9. Find the missing number in the sequence: 8, 9, ____, 11, 12.
10The sequence increases by 1 each step: 9 + 1 = 10.
10. Find the missing number in the sequence: 16, 21, ____, 31, 36.
26The sequence increases by 5 each step: 21 + 5 = 26.
11. Find the missing number in the sequence: 8, 13, ____, 23, 28.
18The sequence increases by 5 each step: 13 + 5 = 18.
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 77 · 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: 10, 12, ____, 16, 18.
2. Find the missing number in the sequence: 9, 10, ____, 12, 13.
3. Find the missing number in the sequence: 5, 7, ____, 11, 13.
4. Find the missing number in the sequence: 2, 4, ____, 8, 10.
5. Find the missing number in the sequence: 2, 7, ____, 17, 22.
6. Find the missing number in the sequence: 7, 12, ____, 22, 27.
7. Find the missing number in the sequence: 4, 6, ____, 10, 12.
8. Find the missing number in the sequence: 16, 18, ____, 22, 24.
9. Find the missing number in the sequence: 8, 9, ____, 11, 12.
10. Find the missing number in the sequence: 16, 21, ____, 31, 36.
11. Find the missing number in the sequence: 8, 13, ____, 23, 28.
12. Find the missing number in the sequence: 12, 14, ____, 18, 20.
12 questions · Seed 77 · 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: 10, 12, ____, 16, 18.
14The sequence increases by 2 each step: 12 + 2 = 14.
2. Find the missing number in the sequence: 9, 10, ____, 12, 13.
11The sequence increases by 1 each step: 10 + 1 = 11.
3. Find the missing number in the sequence: 5, 7, ____, 11, 13.
9The sequence increases by 2 each step: 7 + 2 = 9.
4. Find the missing number in the sequence: 2, 4, ____, 8, 10.
6The sequence increases by 2 each step: 4 + 2 = 6.
5. Find the missing number in the sequence: 2, 7, ____, 17, 22.
12The sequence increases by 5 each step: 7 + 5 = 12.
6. Find the missing number in the sequence: 7, 12, ____, 22, 27.
17The sequence increases by 5 each step: 12 + 5 = 17.
7. Find the missing number in the sequence: 4, 6, ____, 10, 12.
8The sequence increases by 2 each step: 6 + 2 = 8.
8. Find the missing number in the sequence: 16, 18, ____, 22, 24.
20The sequence increases by 2 each step: 18 + 2 = 20.
9. Find the missing number in the sequence: 8, 9, ____, 11, 12.
10The sequence increases by 1 each step: 9 + 1 = 10.
10. Find the missing number in the sequence: 16, 21, ____, 31, 36.
26The sequence increases by 5 each step: 21 + 5 = 26.
11. Find the missing number in the sequence: 8, 13, ____, 23, 28.
18The sequence increases by 5 each step: 13 + 5 = 18.
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 77 · Age guidance, not curriculum certification