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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, 11, ____, 13, 14.
2. Find the missing number in the sequence: 18, 23, ____, 33, 38.
3. Find the missing number in the sequence: 20, 22, ____, 26, 28.
4. Find the missing number in the sequence: 4, 9, ____, 19, 24.
5. Find the missing number in the sequence: 5, 6, ____, 8, 9.
6. Find the missing number in the sequence: 11, 13, ____, 17, 19.
7. Find the missing number in the sequence: 15, 16, ____, 18, 19.
8. Find the missing number in the sequence: 1, 3, ____, 7, 9.
9. Find the missing number in the sequence: 9, 14, ____, 24, 29.
10. Find the missing number in the sequence: 6, 11, ____, 21, 26.
11. Find the missing number in the sequence: 3, 5, ____, 9, 11.
12. Find the missing number in the sequence: 19, 21, ____, 25, 27.
12 questions · Seed 60 · 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, 11, ____, 13, 14.
12The sequence increases by 1 each step: 11 + 1 = 12.
2. Find the missing number in the sequence: 18, 23, ____, 33, 38.
28The sequence increases by 5 each step: 23 + 5 = 28.
3. Find the missing number in the sequence: 20, 22, ____, 26, 28.
24The sequence increases by 2 each step: 22 + 2 = 24.
4. Find the missing number in the sequence: 4, 9, ____, 19, 24.
14The sequence increases by 5 each step: 9 + 5 = 14.
5. Find the missing number in the sequence: 5, 6, ____, 8, 9.
7The sequence increases by 1 each step: 6 + 1 = 7.
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: 15, 16, ____, 18, 19.
17The sequence increases by 1 each step: 16 + 1 = 17.
8. Find the missing number in the sequence: 1, 3, ____, 7, 9.
5The sequence increases by 2 each step: 3 + 2 = 5.
9. Find the missing number in the sequence: 9, 14, ____, 24, 29.
19The sequence increases by 5 each step: 14 + 5 = 19.
10. Find the missing number in the sequence: 6, 11, ____, 21, 26.
16The sequence increases by 5 each step: 11 + 5 = 16.
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: 19, 21, ____, 25, 27.
23The sequence increases by 2 each step: 21 + 2 = 23.
12 questions · Seed 60 · 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, 11, ____, 13, 14.
2. Find the missing number in the sequence: 18, 23, ____, 33, 38.
3. Find the missing number in the sequence: 20, 22, ____, 26, 28.
4. Find the missing number in the sequence: 4, 9, ____, 19, 24.
5. Find the missing number in the sequence: 5, 6, ____, 8, 9.
6. Find the missing number in the sequence: 11, 13, ____, 17, 19.
7. Find the missing number in the sequence: 15, 16, ____, 18, 19.
8. Find the missing number in the sequence: 1, 3, ____, 7, 9.
9. Find the missing number in the sequence: 9, 14, ____, 24, 29.
10. Find the missing number in the sequence: 6, 11, ____, 21, 26.
11. Find the missing number in the sequence: 3, 5, ____, 9, 11.
12. Find the missing number in the sequence: 19, 21, ____, 25, 27.
12 questions · Seed 60 · 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, 11, ____, 13, 14.
12The sequence increases by 1 each step: 11 + 1 = 12.
2. Find the missing number in the sequence: 18, 23, ____, 33, 38.
28The sequence increases by 5 each step: 23 + 5 = 28.
3. Find the missing number in the sequence: 20, 22, ____, 26, 28.
24The sequence increases by 2 each step: 22 + 2 = 24.
4. Find the missing number in the sequence: 4, 9, ____, 19, 24.
14The sequence increases by 5 each step: 9 + 5 = 14.
5. Find the missing number in the sequence: 5, 6, ____, 8, 9.
7The sequence increases by 1 each step: 6 + 1 = 7.
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: 15, 16, ____, 18, 19.
17The sequence increases by 1 each step: 16 + 1 = 17.
8. Find the missing number in the sequence: 1, 3, ____, 7, 9.
5The sequence increases by 2 each step: 3 + 2 = 5.
9. Find the missing number in the sequence: 9, 14, ____, 24, 29.
19The sequence increases by 5 each step: 14 + 5 = 19.
10. Find the missing number in the sequence: 6, 11, ____, 21, 26.
16The sequence increases by 5 each step: 11 + 5 = 16.
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: 19, 21, ____, 25, 27.
23The sequence increases by 2 each step: 21 + 2 = 23.
12 questions · Seed 60 · Age guidance, not curriculum certification