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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: 19, 20, ____, 22, 23.
3. Find the missing number in the sequence: 17, 22, ____, 32, 37.
4. Find the missing number in the sequence: 6, 7, ____, 9, 10.
5. Find the missing number in the sequence: 20, 21, ____, 23, 24.
6. Find the missing number in the sequence: 4, 6, ____, 10, 12.
7. Find the missing number in the sequence: 2, 4, ____, 8, 10.
8. Find the missing number in the sequence: 18, 23, ____, 33, 38.
9. Find the missing number in the sequence: 18, 19, ____, 21, 22.
10. Find the missing number in the sequence: 3, 4, ____, 6, 7.
11. Find the missing number in the sequence: 11, 13, ____, 17, 19.
12. Find the missing number in the sequence: 13, 18, ____, 28, 33.
12 questions · Seed 50 · 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: 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: 6, 7, ____, 9, 10.
8The sequence increases by 1 each step: 7 + 1 = 8.
5. Find the missing number in the sequence: 20, 21, ____, 23, 24.
22The sequence increases by 1 each step: 21 + 1 = 22.
6. Find the missing number in the sequence: 4, 6, ____, 10, 12.
8The sequence increases by 2 each step: 6 + 2 = 8.
7. Find the missing number in the sequence: 2, 4, ____, 8, 10.
6The sequence increases by 2 each step: 4 + 2 = 6.
8. Find the missing number in the sequence: 18, 23, ____, 33, 38.
28The sequence increases by 5 each step: 23 + 5 = 28.
9. Find the missing number in the sequence: 18, 19, ____, 21, 22.
20The sequence increases by 1 each step: 19 + 1 = 20.
10. Find the missing number in the sequence: 3, 4, ____, 6, 7.
5The sequence increases by 1 each step: 4 + 1 = 5.
11. Find the missing number in the sequence: 11, 13, ____, 17, 19.
15The sequence increases by 2 each step: 13 + 2 = 15.
12. Find the missing number in the sequence: 13, 18, ____, 28, 33.
23The sequence increases by 5 each step: 18 + 5 = 23.
12 questions · Seed 50 · 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: 19, 20, ____, 22, 23.
3. Find the missing number in the sequence: 17, 22, ____, 32, 37.
4. Find the missing number in the sequence: 6, 7, ____, 9, 10.
5. Find the missing number in the sequence: 20, 21, ____, 23, 24.
6. Find the missing number in the sequence: 4, 6, ____, 10, 12.
7. Find the missing number in the sequence: 2, 4, ____, 8, 10.
8. Find the missing number in the sequence: 18, 23, ____, 33, 38.
9. Find the missing number in the sequence: 18, 19, ____, 21, 22.
10. Find the missing number in the sequence: 3, 4, ____, 6, 7.
11. Find the missing number in the sequence: 11, 13, ____, 17, 19.
12. Find the missing number in the sequence: 13, 18, ____, 28, 33.
12 questions · Seed 50 · 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: 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: 6, 7, ____, 9, 10.
8The sequence increases by 1 each step: 7 + 1 = 8.
5. Find the missing number in the sequence: 20, 21, ____, 23, 24.
22The sequence increases by 1 each step: 21 + 1 = 22.
6. Find the missing number in the sequence: 4, 6, ____, 10, 12.
8The sequence increases by 2 each step: 6 + 2 = 8.
7. Find the missing number in the sequence: 2, 4, ____, 8, 10.
6The sequence increases by 2 each step: 4 + 2 = 6.
8. Find the missing number in the sequence: 18, 23, ____, 33, 38.
28The sequence increases by 5 each step: 23 + 5 = 28.
9. Find the missing number in the sequence: 18, 19, ____, 21, 22.
20The sequence increases by 1 each step: 19 + 1 = 20.
10. Find the missing number in the sequence: 3, 4, ____, 6, 7.
5The sequence increases by 1 each step: 4 + 1 = 5.
11. Find the missing number in the sequence: 11, 13, ____, 17, 19.
15The sequence increases by 2 each step: 13 + 2 = 15.
12. Find the missing number in the sequence: 13, 18, ____, 28, 33.
23The sequence increases by 5 each step: 18 + 5 = 23.
12 questions · Seed 50 · Age guidance, not curriculum certification