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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: 18, 23, ____, 33, 38.
2. Find the missing number in the sequence: 5, 7, ____, 11, 13.
3. Find the missing number in the sequence: 17, 19, ____, 23, 25.
4. Find the missing number in the sequence: 8, 13, ____, 23, 28.
5. Find the missing number in the sequence: 6, 7, ____, 9, 10.
6. Find the missing number in the sequence: 4, 5, ____, 7, 8.
7. Find the missing number in the sequence: 4, 9, ____, 19, 24.
8. Find the missing number in the sequence: 7, 9, ____, 13, 15.
9. Find the missing number in the sequence: 3, 8, ____, 18, 23.
10. Find the missing number in the sequence: 11, 13, ____, 17, 19.
11. Find the missing number in the sequence: 5, 10, ____, 20, 25.
12. Find the missing number in the sequence: 16, 17, ____, 19, 20.
12 questions · Seed 104751 · 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: 18, 23, ____, 33, 38.
28The sequence increases by 5 each step: 23 + 5 = 28.
2. Find the missing number in the sequence: 5, 7, ____, 11, 13.
9The sequence increases by 2 each step: 7 + 2 = 9.
3. Find the missing number in the sequence: 17, 19, ____, 23, 25.
21The sequence increases by 2 each step: 19 + 2 = 21.
4. Find the missing number in the sequence: 8, 13, ____, 23, 28.
18The sequence increases by 5 each step: 13 + 5 = 18.
5. Find the missing number in the sequence: 6, 7, ____, 9, 10.
8The sequence increases by 1 each step: 7 + 1 = 8.
6. Find the missing number in the sequence: 4, 5, ____, 7, 8.
6The sequence increases by 1 each step: 5 + 1 = 6.
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: 7, 9, ____, 13, 15.
11The sequence increases by 2 each step: 9 + 2 = 11.
9. Find the missing number in the sequence: 3, 8, ____, 18, 23.
13The sequence increases by 5 each step: 8 + 5 = 13.
10. Find the missing number in the sequence: 11, 13, ____, 17, 19.
15The sequence increases by 2 each step: 13 + 2 = 15.
11. Find the missing number in the sequence: 5, 10, ____, 20, 25.
15The sequence increases by 5 each step: 10 + 5 = 15.
12. Find the missing number in the sequence: 16, 17, ____, 19, 20.
18The sequence increases by 1 each step: 17 + 1 = 18.
12 questions · Seed 104751 · 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: 18, 23, ____, 33, 38.
2. Find the missing number in the sequence: 5, 7, ____, 11, 13.
3. Find the missing number in the sequence: 17, 19, ____, 23, 25.
4. Find the missing number in the sequence: 8, 13, ____, 23, 28.
5. Find the missing number in the sequence: 6, 7, ____, 9, 10.
6. Find the missing number in the sequence: 4, 5, ____, 7, 8.
7. Find the missing number in the sequence: 4, 9, ____, 19, 24.
8. Find the missing number in the sequence: 7, 9, ____, 13, 15.
9. Find the missing number in the sequence: 3, 8, ____, 18, 23.
10. Find the missing number in the sequence: 11, 13, ____, 17, 19.
11. Find the missing number in the sequence: 5, 10, ____, 20, 25.
12. Find the missing number in the sequence: 16, 17, ____, 19, 20.
12 questions · Seed 104751 · 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: 18, 23, ____, 33, 38.
28The sequence increases by 5 each step: 23 + 5 = 28.
2. Find the missing number in the sequence: 5, 7, ____, 11, 13.
9The sequence increases by 2 each step: 7 + 2 = 9.
3. Find the missing number in the sequence: 17, 19, ____, 23, 25.
21The sequence increases by 2 each step: 19 + 2 = 21.
4. Find the missing number in the sequence: 8, 13, ____, 23, 28.
18The sequence increases by 5 each step: 13 + 5 = 18.
5. Find the missing number in the sequence: 6, 7, ____, 9, 10.
8The sequence increases by 1 each step: 7 + 1 = 8.
6. Find the missing number in the sequence: 4, 5, ____, 7, 8.
6The sequence increases by 1 each step: 5 + 1 = 6.
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: 7, 9, ____, 13, 15.
11The sequence increases by 2 each step: 9 + 2 = 11.
9. Find the missing number in the sequence: 3, 8, ____, 18, 23.
13The sequence increases by 5 each step: 8 + 5 = 13.
10. Find the missing number in the sequence: 11, 13, ____, 17, 19.
15The sequence increases by 2 each step: 13 + 2 = 15.
11. Find the missing number in the sequence: 5, 10, ____, 20, 25.
15The sequence increases by 5 each step: 10 + 5 = 15.
12. Find the missing number in the sequence: 16, 17, ____, 19, 20.
18The sequence increases by 1 each step: 17 + 1 = 18.
12 questions · Seed 104751 · Age guidance, not curriculum certification