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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: 9, 11, ____, 15, 17.
2. Find the missing number in the sequence: 5, 6, ____, 8, 9.
3. Find the missing number in the sequence: 19, 24, ____, 34, 39.
4. Find the missing number in the sequence: 12, 17, ____, 27, 32.
5. Find the missing number in the sequence: 18, 20, ____, 24, 26.
6. Find the missing number in the sequence: 10, 12, ____, 16, 18.
7. Find the missing number in the sequence: 13, 14, ____, 16, 17.
8. Find the missing number in the sequence: 7, 8, ____, 10, 11.
9. Find the missing number in the sequence: 5, 10, ____, 20, 25.
10. Find the missing number in the sequence: 15, 20, ____, 30, 35.
11. Find the missing number in the sequence: 15, 17, ____, 21, 23.
12. Find the missing number in the sequence: 6, 8, ____, 12, 14.
12 questions · Seed 104738 · 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: 9, 11, ____, 15, 17.
13The sequence increases by 2 each step: 11 + 2 = 13.
2. Find the missing number in the sequence: 5, 6, ____, 8, 9.
7The sequence increases by 1 each step: 6 + 1 = 7.
3. Find the missing number in the sequence: 19, 24, ____, 34, 39.
29The sequence increases by 5 each step: 24 + 5 = 29.
4. Find the missing number in the sequence: 12, 17, ____, 27, 32.
22The sequence increases by 5 each step: 17 + 5 = 22.
5. Find the missing number in the sequence: 18, 20, ____, 24, 26.
22The sequence increases by 2 each step: 20 + 2 = 22.
6. Find the missing number in the sequence: 10, 12, ____, 16, 18.
14The sequence increases by 2 each step: 12 + 2 = 14.
7. Find the missing number in the sequence: 13, 14, ____, 16, 17.
15The sequence increases by 1 each step: 14 + 1 = 15.
8. Find the missing number in the sequence: 7, 8, ____, 10, 11.
9The sequence increases by 1 each step: 8 + 1 = 9.
9. Find the missing number in the sequence: 5, 10, ____, 20, 25.
15The sequence increases by 5 each step: 10 + 5 = 15.
10. Find the missing number in the sequence: 15, 20, ____, 30, 35.
25The sequence increases by 5 each step: 20 + 5 = 25.
11. Find the missing number in the sequence: 15, 17, ____, 21, 23.
19The sequence increases by 2 each step: 17 + 2 = 19.
12. Find the missing number in the sequence: 6, 8, ____, 12, 14.
10The sequence increases by 2 each step: 8 + 2 = 10.
12 questions · Seed 104738 · 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: 9, 11, ____, 15, 17.
2. Find the missing number in the sequence: 5, 6, ____, 8, 9.
3. Find the missing number in the sequence: 19, 24, ____, 34, 39.
4. Find the missing number in the sequence: 12, 17, ____, 27, 32.
5. Find the missing number in the sequence: 18, 20, ____, 24, 26.
6. Find the missing number in the sequence: 10, 12, ____, 16, 18.
7. Find the missing number in the sequence: 13, 14, ____, 16, 17.
8. Find the missing number in the sequence: 7, 8, ____, 10, 11.
9. Find the missing number in the sequence: 5, 10, ____, 20, 25.
10. Find the missing number in the sequence: 15, 20, ____, 30, 35.
11. Find the missing number in the sequence: 15, 17, ____, 21, 23.
12. Find the missing number in the sequence: 6, 8, ____, 12, 14.
12 questions · Seed 104738 · 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: 9, 11, ____, 15, 17.
13The sequence increases by 2 each step: 11 + 2 = 13.
2. Find the missing number in the sequence: 5, 6, ____, 8, 9.
7The sequence increases by 1 each step: 6 + 1 = 7.
3. Find the missing number in the sequence: 19, 24, ____, 34, 39.
29The sequence increases by 5 each step: 24 + 5 = 29.
4. Find the missing number in the sequence: 12, 17, ____, 27, 32.
22The sequence increases by 5 each step: 17 + 5 = 22.
5. Find the missing number in the sequence: 18, 20, ____, 24, 26.
22The sequence increases by 2 each step: 20 + 2 = 22.
6. Find the missing number in the sequence: 10, 12, ____, 16, 18.
14The sequence increases by 2 each step: 12 + 2 = 14.
7. Find the missing number in the sequence: 13, 14, ____, 16, 17.
15The sequence increases by 1 each step: 14 + 1 = 15.
8. Find the missing number in the sequence: 7, 8, ____, 10, 11.
9The sequence increases by 1 each step: 8 + 1 = 9.
9. Find the missing number in the sequence: 5, 10, ____, 20, 25.
15The sequence increases by 5 each step: 10 + 5 = 15.
10. Find the missing number in the sequence: 15, 20, ____, 30, 35.
25The sequence increases by 5 each step: 20 + 5 = 25.
11. Find the missing number in the sequence: 15, 17, ____, 21, 23.
19The sequence increases by 2 each step: 17 + 2 = 19.
12. Find the missing number in the sequence: 6, 8, ____, 12, 14.
10The sequence increases by 2 each step: 8 + 2 = 10.
12 questions · Seed 104738 · Age guidance, not curriculum certification