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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: 1, 6, ____, 16, 21.
2. Find the missing number in the sequence: 6, 8, ____, 12, 14.
3. Find the missing number in the sequence: 18, 20, ____, 24, 26.
4. Find the missing number in the sequence: 4, 6, ____, 10, 12.
5. Find the missing number in the sequence: 16, 18, ____, 22, 24.
6. Find the missing number in the sequence: 16, 17, ____, 19, 20.
7. Find the missing number in the sequence: 16, 21, ____, 31, 36.
8. Find the missing number in the sequence: 13, 15, ____, 19, 21.
9. Find the missing number in the sequence: 6, 7, ____, 9, 10.
10. Find the missing number in the sequence: 10, 11, ____, 13, 14.
11. Find the missing number in the sequence: 11, 13, ____, 17, 19.
12. Find the missing number in the sequence: 2, 3, ____, 5, 6.
12 questions · Seed 95 · 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: 1, 6, ____, 16, 21.
11The sequence increases by 5 each step: 6 + 5 = 11.
2. Find the missing number in the sequence: 6, 8, ____, 12, 14.
10The sequence increases by 2 each step: 8 + 2 = 10.
3. Find the missing number in the sequence: 18, 20, ____, 24, 26.
22The sequence increases by 2 each step: 20 + 2 = 22.
4. Find the missing number in the sequence: 4, 6, ____, 10, 12.
8The sequence increases by 2 each step: 6 + 2 = 8.
5. Find the missing number in the sequence: 16, 18, ____, 22, 24.
20The sequence increases by 2 each step: 18 + 2 = 20.
6. Find the missing number in the sequence: 16, 17, ____, 19, 20.
18The sequence increases by 1 each step: 17 + 1 = 18.
7. Find the missing number in the sequence: 16, 21, ____, 31, 36.
26The sequence increases by 5 each step: 21 + 5 = 26.
8. Find the missing number in the sequence: 13, 15, ____, 19, 21.
17The sequence increases by 2 each step: 15 + 2 = 17.
9. Find the missing number in the sequence: 6, 7, ____, 9, 10.
8The sequence increases by 1 each step: 7 + 1 = 8.
10. Find the missing number in the sequence: 10, 11, ____, 13, 14.
12The sequence increases by 1 each step: 11 + 1 = 12.
11. Find the missing number in the sequence: 11, 13, ____, 17, 19.
15The sequence increases by 2 each step: 13 + 2 = 15.
12. Find the missing number in the sequence: 2, 3, ____, 5, 6.
4The sequence increases by 1 each step: 3 + 1 = 4.
12 questions · Seed 95 · 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: 1, 6, ____, 16, 21.
2. Find the missing number in the sequence: 6, 8, ____, 12, 14.
3. Find the missing number in the sequence: 18, 20, ____, 24, 26.
4. Find the missing number in the sequence: 4, 6, ____, 10, 12.
5. Find the missing number in the sequence: 16, 18, ____, 22, 24.
6. Find the missing number in the sequence: 16, 17, ____, 19, 20.
7. Find the missing number in the sequence: 16, 21, ____, 31, 36.
8. Find the missing number in the sequence: 13, 15, ____, 19, 21.
9. Find the missing number in the sequence: 6, 7, ____, 9, 10.
10. Find the missing number in the sequence: 10, 11, ____, 13, 14.
11. Find the missing number in the sequence: 11, 13, ____, 17, 19.
12. Find the missing number in the sequence: 2, 3, ____, 5, 6.
12 questions · Seed 95 · 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: 1, 6, ____, 16, 21.
11The sequence increases by 5 each step: 6 + 5 = 11.
2. Find the missing number in the sequence: 6, 8, ____, 12, 14.
10The sequence increases by 2 each step: 8 + 2 = 10.
3. Find the missing number in the sequence: 18, 20, ____, 24, 26.
22The sequence increases by 2 each step: 20 + 2 = 22.
4. Find the missing number in the sequence: 4, 6, ____, 10, 12.
8The sequence increases by 2 each step: 6 + 2 = 8.
5. Find the missing number in the sequence: 16, 18, ____, 22, 24.
20The sequence increases by 2 each step: 18 + 2 = 20.
6. Find the missing number in the sequence: 16, 17, ____, 19, 20.
18The sequence increases by 1 each step: 17 + 1 = 18.
7. Find the missing number in the sequence: 16, 21, ____, 31, 36.
26The sequence increases by 5 each step: 21 + 5 = 26.
8. Find the missing number in the sequence: 13, 15, ____, 19, 21.
17The sequence increases by 2 each step: 15 + 2 = 17.
9. Find the missing number in the sequence: 6, 7, ____, 9, 10.
8The sequence increases by 1 each step: 7 + 1 = 8.
10. Find the missing number in the sequence: 10, 11, ____, 13, 14.
12The sequence increases by 1 each step: 11 + 1 = 12.
11. Find the missing number in the sequence: 11, 13, ____, 17, 19.
15The sequence increases by 2 each step: 13 + 2 = 15.
12. Find the missing number in the sequence: 2, 3, ____, 5, 6.
4The sequence increases by 1 each step: 3 + 1 = 4.
12 questions · Seed 95 · Age guidance, not curriculum certification