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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: 14, 15, ____, 17, 18.
2. Find the missing number in the sequence: 14, 19, ____, 29, 34.
3. Find the missing number in the sequence: 4, 5, ____, 7, 8.
4. Find the missing number in the sequence: 18, 23, ____, 33, 38.
5. Find the missing number in the sequence: 2, 3, ____, 5, 6.
6. Find the missing number in the sequence: 8, 13, ____, 23, 28.
7. Find the missing number in the sequence: 12, 13, ____, 15, 16.
8. Find the missing number in the sequence: 20, 22, ____, 26, 28.
9. Find the missing number in the sequence: 10, 11, ____, 13, 14.
10. Find the missing number in the sequence: 9, 11, ____, 15, 17.
11. Find the missing number in the sequence: 6, 7, ____, 9, 10.
12. Find the missing number in the sequence: 16, 18, ____, 22, 24.
12 questions · Seed 107 · 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: 14, 15, ____, 17, 18.
16The sequence increases by 1 each step: 15 + 1 = 16.
2. Find the missing number in the sequence: 14, 19, ____, 29, 34.
24The sequence increases by 5 each step: 19 + 5 = 24.
3. Find the missing number in the sequence: 4, 5, ____, 7, 8.
6The sequence increases by 1 each step: 5 + 1 = 6.
4. Find the missing number in the sequence: 18, 23, ____, 33, 38.
28The sequence increases by 5 each step: 23 + 5 = 28.
5. Find the missing number in the sequence: 2, 3, ____, 5, 6.
4The sequence increases by 1 each step: 3 + 1 = 4.
6. Find the missing number in the sequence: 8, 13, ____, 23, 28.
18The sequence increases by 5 each step: 13 + 5 = 18.
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: 20, 22, ____, 26, 28.
24The sequence increases by 2 each step: 22 + 2 = 24.
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: 9, 11, ____, 15, 17.
13The sequence increases by 2 each step: 11 + 2 = 13.
11. Find the missing number in the sequence: 6, 7, ____, 9, 10.
8The sequence increases by 1 each step: 7 + 1 = 8.
12. Find the missing number in the sequence: 16, 18, ____, 22, 24.
20The sequence increases by 2 each step: 18 + 2 = 20.
12 questions · Seed 107 · 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: 14, 15, ____, 17, 18.
2. Find the missing number in the sequence: 14, 19, ____, 29, 34.
3. Find the missing number in the sequence: 4, 5, ____, 7, 8.
4. Find the missing number in the sequence: 18, 23, ____, 33, 38.
5. Find the missing number in the sequence: 2, 3, ____, 5, 6.
6. Find the missing number in the sequence: 8, 13, ____, 23, 28.
7. Find the missing number in the sequence: 12, 13, ____, 15, 16.
8. Find the missing number in the sequence: 20, 22, ____, 26, 28.
9. Find the missing number in the sequence: 10, 11, ____, 13, 14.
10. Find the missing number in the sequence: 9, 11, ____, 15, 17.
11. Find the missing number in the sequence: 6, 7, ____, 9, 10.
12. Find the missing number in the sequence: 16, 18, ____, 22, 24.
12 questions · Seed 107 · 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: 14, 15, ____, 17, 18.
16The sequence increases by 1 each step: 15 + 1 = 16.
2. Find the missing number in the sequence: 14, 19, ____, 29, 34.
24The sequence increases by 5 each step: 19 + 5 = 24.
3. Find the missing number in the sequence: 4, 5, ____, 7, 8.
6The sequence increases by 1 each step: 5 + 1 = 6.
4. Find the missing number in the sequence: 18, 23, ____, 33, 38.
28The sequence increases by 5 each step: 23 + 5 = 28.
5. Find the missing number in the sequence: 2, 3, ____, 5, 6.
4The sequence increases by 1 each step: 3 + 1 = 4.
6. Find the missing number in the sequence: 8, 13, ____, 23, 28.
18The sequence increases by 5 each step: 13 + 5 = 18.
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: 20, 22, ____, 26, 28.
24The sequence increases by 2 each step: 22 + 2 = 24.
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: 9, 11, ____, 15, 17.
13The sequence increases by 2 each step: 11 + 2 = 13.
11. Find the missing number in the sequence: 6, 7, ____, 9, 10.
8The sequence increases by 1 each step: 7 + 1 = 8.
12. Find the missing number in the sequence: 16, 18, ____, 22, 24.
20The sequence increases by 2 each step: 18 + 2 = 20.
12 questions · Seed 107 · Age guidance, not curriculum certification