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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: 11, 13, ____, 17, 19.
2. Find the missing number in the sequence: 11, 12, ____, 14, 15.
3. Find the missing number in the sequence: 15, 17, ____, 21, 23.
4. Find the missing number in the sequence: 5, 7, ____, 11, 13.
5. Find the missing number in the sequence: 19, 24, ____, 34, 39.
6. Find the missing number in the sequence: 14, 15, ____, 17, 18.
7. Find the missing number in the sequence: 4, 9, ____, 19, 24.
8. Find the missing number in the sequence: 12, 17, ____, 27, 32.
9. Find the missing number in the sequence: 9, 10, ____, 12, 13.
10. Find the missing number in the sequence: 5, 6, ____, 8, 9.
11. Find the missing number in the sequence: 14, 19, ____, 29, 34.
12. Find the missing number in the sequence: 1, 2, ____, 4, 5.
12 questions · Seed 104736 · 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: 11, 13, ____, 17, 19.
15The sequence increases by 2 each step: 13 + 2 = 15.
2. Find the missing number in the sequence: 11, 12, ____, 14, 15.
13The sequence increases by 1 each step: 12 + 1 = 13.
3. Find the missing number in the sequence: 15, 17, ____, 21, 23.
19The sequence increases by 2 each step: 17 + 2 = 19.
4. Find the missing number in the sequence: 5, 7, ____, 11, 13.
9The sequence increases by 2 each step: 7 + 2 = 9.
5. Find the missing number in the sequence: 19, 24, ____, 34, 39.
29The sequence increases by 5 each step: 24 + 5 = 29.
6. Find the missing number in the sequence: 14, 15, ____, 17, 18.
16The sequence increases by 1 each step: 15 + 1 = 16.
7. Find the missing number in the sequence: 4, 9, ____, 19, 24.
14The sequence increases by 5 each step: 9 + 5 = 14.
8. Find the missing number in the sequence: 12, 17, ____, 27, 32.
22The sequence increases by 5 each step: 17 + 5 = 22.
9. Find the missing number in the sequence: 9, 10, ____, 12, 13.
11The sequence increases by 1 each step: 10 + 1 = 11.
10. Find the missing number in the sequence: 5, 6, ____, 8, 9.
7The sequence increases by 1 each step: 6 + 1 = 7.
11. Find the missing number in the sequence: 14, 19, ____, 29, 34.
24The sequence increases by 5 each step: 19 + 5 = 24.
12. Find the missing number in the sequence: 1, 2, ____, 4, 5.
3The sequence increases by 1 each step: 2 + 1 = 3.
12 questions · Seed 104736 · 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: 11, 13, ____, 17, 19.
2. Find the missing number in the sequence: 11, 12, ____, 14, 15.
3. Find the missing number in the sequence: 15, 17, ____, 21, 23.
4. Find the missing number in the sequence: 5, 7, ____, 11, 13.
5. Find the missing number in the sequence: 19, 24, ____, 34, 39.
6. Find the missing number in the sequence: 14, 15, ____, 17, 18.
7. Find the missing number in the sequence: 4, 9, ____, 19, 24.
8. Find the missing number in the sequence: 12, 17, ____, 27, 32.
9. Find the missing number in the sequence: 9, 10, ____, 12, 13.
10. Find the missing number in the sequence: 5, 6, ____, 8, 9.
11. Find the missing number in the sequence: 14, 19, ____, 29, 34.
12. Find the missing number in the sequence: 1, 2, ____, 4, 5.
12 questions · Seed 104736 · 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: 11, 13, ____, 17, 19.
15The sequence increases by 2 each step: 13 + 2 = 15.
2. Find the missing number in the sequence: 11, 12, ____, 14, 15.
13The sequence increases by 1 each step: 12 + 1 = 13.
3. Find the missing number in the sequence: 15, 17, ____, 21, 23.
19The sequence increases by 2 each step: 17 + 2 = 19.
4. Find the missing number in the sequence: 5, 7, ____, 11, 13.
9The sequence increases by 2 each step: 7 + 2 = 9.
5. Find the missing number in the sequence: 19, 24, ____, 34, 39.
29The sequence increases by 5 each step: 24 + 5 = 29.
6. Find the missing number in the sequence: 14, 15, ____, 17, 18.
16The sequence increases by 1 each step: 15 + 1 = 16.
7. Find the missing number in the sequence: 4, 9, ____, 19, 24.
14The sequence increases by 5 each step: 9 + 5 = 14.
8. Find the missing number in the sequence: 12, 17, ____, 27, 32.
22The sequence increases by 5 each step: 17 + 5 = 22.
9. Find the missing number in the sequence: 9, 10, ____, 12, 13.
11The sequence increases by 1 each step: 10 + 1 = 11.
10. Find the missing number in the sequence: 5, 6, ____, 8, 9.
7The sequence increases by 1 each step: 6 + 1 = 7.
11. Find the missing number in the sequence: 14, 19, ____, 29, 34.
24The sequence increases by 5 each step: 19 + 5 = 24.
12. Find the missing number in the sequence: 1, 2, ____, 4, 5.
3The sequence increases by 1 each step: 2 + 1 = 3.
12 questions · Seed 104736 · Age guidance, not curriculum certification