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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: 5, 7, ____, 11, 13.
2. Find the missing number in the sequence: 19, 20, ____, 22, 23.
3. Find the missing number in the sequence: 17, 22, ____, 32, 37.
4. Find the missing number in the sequence: 20, 21, ____, 23, 24.
5. Find the missing number in the sequence: 16, 21, ____, 31, 36.
6. Find the missing number in the sequence: 15, 16, ____, 18, 19.
7. Find the missing number in the sequence: 4, 9, ____, 19, 24.
8. Find the missing number in the sequence: 19, 24, ____, 34, 39.
9. Find the missing number in the sequence: 1, 3, ____, 7, 9.
10. Find the missing number in the sequence: 7, 8, ____, 10, 11.
11. Find the missing number in the sequence: 9, 14, ____, 24, 29.
12. Find the missing number in the sequence: 8, 10, ____, 14, 16.
12 questions · Seed 102 · 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: 5, 7, ____, 11, 13.
9The sequence increases by 2 each step: 7 + 2 = 9.
2. Find the missing number in the sequence: 19, 20, ____, 22, 23.
21The sequence increases by 1 each step: 20 + 1 = 21.
3. Find the missing number in the sequence: 17, 22, ____, 32, 37.
27The sequence increases by 5 each step: 22 + 5 = 27.
4. Find the missing number in the sequence: 20, 21, ____, 23, 24.
22The sequence increases by 1 each step: 21 + 1 = 22.
5. Find the missing number in the sequence: 16, 21, ____, 31, 36.
26The sequence increases by 5 each step: 21 + 5 = 26.
6. Find the missing number in the sequence: 15, 16, ____, 18, 19.
17The sequence increases by 1 each step: 16 + 1 = 17.
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: 19, 24, ____, 34, 39.
29The sequence increases by 5 each step: 24 + 5 = 29.
9. Find the missing number in the sequence: 1, 3, ____, 7, 9.
5The sequence increases by 2 each step: 3 + 2 = 5.
10. Find the missing number in the sequence: 7, 8, ____, 10, 11.
9The sequence increases by 1 each step: 8 + 1 = 9.
11. Find the missing number in the sequence: 9, 14, ____, 24, 29.
19The sequence increases by 5 each step: 14 + 5 = 19.
12. Find the missing number in the sequence: 8, 10, ____, 14, 16.
12The sequence increases by 2 each step: 10 + 2 = 12.
12 questions · Seed 102 · 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: 5, 7, ____, 11, 13.
2. Find the missing number in the sequence: 19, 20, ____, 22, 23.
3. Find the missing number in the sequence: 17, 22, ____, 32, 37.
4. Find the missing number in the sequence: 20, 21, ____, 23, 24.
5. Find the missing number in the sequence: 16, 21, ____, 31, 36.
6. Find the missing number in the sequence: 15, 16, ____, 18, 19.
7. Find the missing number in the sequence: 4, 9, ____, 19, 24.
8. Find the missing number in the sequence: 19, 24, ____, 34, 39.
9. Find the missing number in the sequence: 1, 3, ____, 7, 9.
10. Find the missing number in the sequence: 7, 8, ____, 10, 11.
11. Find the missing number in the sequence: 9, 14, ____, 24, 29.
12. Find the missing number in the sequence: 8, 10, ____, 14, 16.
12 questions · Seed 102 · 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: 5, 7, ____, 11, 13.
9The sequence increases by 2 each step: 7 + 2 = 9.
2. Find the missing number in the sequence: 19, 20, ____, 22, 23.
21The sequence increases by 1 each step: 20 + 1 = 21.
3. Find the missing number in the sequence: 17, 22, ____, 32, 37.
27The sequence increases by 5 each step: 22 + 5 = 27.
4. Find the missing number in the sequence: 20, 21, ____, 23, 24.
22The sequence increases by 1 each step: 21 + 1 = 22.
5. Find the missing number in the sequence: 16, 21, ____, 31, 36.
26The sequence increases by 5 each step: 21 + 5 = 26.
6. Find the missing number in the sequence: 15, 16, ____, 18, 19.
17The sequence increases by 1 each step: 16 + 1 = 17.
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: 19, 24, ____, 34, 39.
29The sequence increases by 5 each step: 24 + 5 = 29.
9. Find the missing number in the sequence: 1, 3, ____, 7, 9.
5The sequence increases by 2 each step: 3 + 2 = 5.
10. Find the missing number in the sequence: 7, 8, ____, 10, 11.
9The sequence increases by 1 each step: 8 + 1 = 9.
11. Find the missing number in the sequence: 9, 14, ____, 24, 29.
19The sequence increases by 5 each step: 14 + 5 = 19.
12. Find the missing number in the sequence: 8, 10, ____, 14, 16.
12The sequence increases by 2 each step: 10 + 2 = 12.
12 questions · Seed 102 · Age guidance, not curriculum certification