Back to worksheetsReasoningAges 4-6
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: 8, 9, ____, 11, 12.
2. Find the missing number in the sequence: 17, 19, ____, 23, 25.
3. Find the missing number in the sequence: 9, 11, ____, 15, 17.
4. Find the missing number in the sequence: 3, 8, ____, 18, 23.
5. Find the missing number in the sequence: 13, 18, ____, 28, 33.
6. Find the missing number in the sequence: 16, 21, ____, 31, 36.
7. Find the missing number in the sequence: 6, 8, ____, 12, 14.
8. Find the missing number in the sequence: 1, 6, ____, 16, 21.
9. Find the missing number in the sequence: 10, 11, ____, 13, 14.
10. Find the missing number in the sequence: 17, 22, ____, 32, 37.
11. Find the missing number in the sequence: 3, 5, ____, 9, 11.
12. Find the missing number in the sequence: 13, 15, ____, 19, 21.
12 questions · Seed 101 · 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: 8, 9, ____, 11, 12.
10The sequence increases by 1 each step: 9 + 1 = 10.
2. Find the missing number in the sequence: 17, 19, ____, 23, 25.
21The sequence increases by 2 each step: 19 + 2 = 21.
3. Find the missing number in the sequence: 9, 11, ____, 15, 17.
13The sequence increases by 2 each step: 11 + 2 = 13.
4. Find the missing number in the sequence: 3, 8, ____, 18, 23.
13The sequence increases by 5 each step: 8 + 5 = 13.
5. Find the missing number in the sequence: 13, 18, ____, 28, 33.
23The sequence increases by 5 each step: 18 + 5 = 23.
6. Find the missing number in the sequence: 16, 21, ____, 31, 36.
26The sequence increases by 5 each step: 21 + 5 = 26.
7. Find the missing number in the sequence: 6, 8, ____, 12, 14.
10The sequence increases by 2 each step: 8 + 2 = 10.
8. Find the missing number in the sequence: 1, 6, ____, 16, 21.
11The sequence increases by 5 each step: 6 + 5 = 11.
9. Find the missing number in the sequence: 10, 11, ____, 13, 14.
12The sequence increases by 1 each step: 11 + 1 = 12.
10. Find the missing number in the sequence: 17, 22, ____, 32, 37.
27The sequence increases by 5 each step: 22 + 5 = 27.
11. Find the missing number in the sequence: 3, 5, ____, 9, 11.
7The sequence increases by 2 each step: 5 + 2 = 7.
12. Find the missing number in the sequence: 13, 15, ____, 19, 21.
17The sequence increases by 2 each step: 15 + 2 = 17.
12 questions · Seed 101 · 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: 8, 9, ____, 11, 12.
2. Find the missing number in the sequence: 17, 19, ____, 23, 25.
3. Find the missing number in the sequence: 9, 11, ____, 15, 17.
4. Find the missing number in the sequence: 3, 8, ____, 18, 23.
5. Find the missing number in the sequence: 13, 18, ____, 28, 33.
6. Find the missing number in the sequence: 16, 21, ____, 31, 36.
7. Find the missing number in the sequence: 6, 8, ____, 12, 14.
8. Find the missing number in the sequence: 1, 6, ____, 16, 21.
9. Find the missing number in the sequence: 10, 11, ____, 13, 14.
10. Find the missing number in the sequence: 17, 22, ____, 32, 37.
11. Find the missing number in the sequence: 3, 5, ____, 9, 11.
12. Find the missing number in the sequence: 13, 15, ____, 19, 21.
12 questions · Seed 101 · 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: 8, 9, ____, 11, 12.
10The sequence increases by 1 each step: 9 + 1 = 10.
2. Find the missing number in the sequence: 17, 19, ____, 23, 25.
21The sequence increases by 2 each step: 19 + 2 = 21.
3. Find the missing number in the sequence: 9, 11, ____, 15, 17.
13The sequence increases by 2 each step: 11 + 2 = 13.
4. Find the missing number in the sequence: 3, 8, ____, 18, 23.
13The sequence increases by 5 each step: 8 + 5 = 13.
5. Find the missing number in the sequence: 13, 18, ____, 28, 33.
23The sequence increases by 5 each step: 18 + 5 = 23.
6. Find the missing number in the sequence: 16, 21, ____, 31, 36.
26The sequence increases by 5 each step: 21 + 5 = 26.
7. Find the missing number in the sequence: 6, 8, ____, 12, 14.
10The sequence increases by 2 each step: 8 + 2 = 10.
8. Find the missing number in the sequence: 1, 6, ____, 16, 21.
11The sequence increases by 5 each step: 6 + 5 = 11.
9. Find the missing number in the sequence: 10, 11, ____, 13, 14.
12The sequence increases by 1 each step: 11 + 1 = 12.
10. Find the missing number in the sequence: 17, 22, ____, 32, 37.
27The sequence increases by 5 each step: 22 + 5 = 27.
11. Find the missing number in the sequence: 3, 5, ____, 9, 11.
7The sequence increases by 2 each step: 5 + 2 = 7.
12. Find the missing number in the sequence: 13, 15, ____, 19, 21.
17The sequence increases by 2 each step: 15 + 2 = 17.
12 questions · Seed 101 · Age guidance, not curriculum certification