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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: 8, 13, ____, 23, 28.
2. Find the missing number in the sequence: 17, 19, ____, 23, 25.
3. Find the missing number in the sequence: 3, 4, ____, 6, 7.
4. Find the missing number in the sequence: 18, 20, ____, 24, 26.
5. Find the missing number in the sequence: 10, 11, ____, 13, 14.
6. Find the missing number in the sequence: 13, 15, ____, 19, 21.
7. Find the missing number in the sequence: 12, 13, ____, 15, 16.
8. Find the missing number in the sequence: 16, 21, ____, 31, 36.
9. Find the missing number in the sequence: 19, 24, ____, 34, 39.
10. Find the missing number in the sequence: 1, 3, ____, 7, 9.
11. Find the missing number in the sequence: 18, 19, ____, 21, 22.
12. Find the missing number in the sequence: 11, 12, ____, 14, 15.
12 questions · Seed 104742 · 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: 8, 13, ____, 23, 28.
18The sequence increases by 5 each step: 13 + 5 = 18.
2. Find the missing number in the sequence: 17, 19, ____, 23, 25.
21The sequence increases by 2 each step: 19 + 2 = 21.
3. Find the missing number in the sequence: 3, 4, ____, 6, 7.
5The sequence increases by 1 each step: 4 + 1 = 5.
4. Find the missing number in the sequence: 18, 20, ____, 24, 26.
22The sequence increases by 2 each step: 20 + 2 = 22.
5. Find the missing number in the sequence: 10, 11, ____, 13, 14.
12The sequence increases by 1 each step: 11 + 1 = 12.
6. Find the missing number in the sequence: 13, 15, ____, 19, 21.
17The sequence increases by 2 each step: 15 + 2 = 17.
7. Find the missing number in the sequence: 12, 13, ____, 15, 16.
14The sequence increases by 1 each step: 13 + 1 = 14.
8. Find the missing number in the sequence: 16, 21, ____, 31, 36.
26The sequence increases by 5 each step: 21 + 5 = 26.
9. Find the missing number in the sequence: 19, 24, ____, 34, 39.
29The sequence increases by 5 each step: 24 + 5 = 29.
10. Find the missing number in the sequence: 1, 3, ____, 7, 9.
5The sequence increases by 2 each step: 3 + 2 = 5.
11. Find the missing number in the sequence: 18, 19, ____, 21, 22.
20The sequence increases by 1 each step: 19 + 1 = 20.
12. Find the missing number in the sequence: 11, 12, ____, 14, 15.
13The sequence increases by 1 each step: 12 + 1 = 13.
12 questions · Seed 104742 · 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: 8, 13, ____, 23, 28.
2. Find the missing number in the sequence: 17, 19, ____, 23, 25.
3. Find the missing number in the sequence: 3, 4, ____, 6, 7.
4. Find the missing number in the sequence: 18, 20, ____, 24, 26.
5. Find the missing number in the sequence: 10, 11, ____, 13, 14.
6. Find the missing number in the sequence: 13, 15, ____, 19, 21.
7. Find the missing number in the sequence: 12, 13, ____, 15, 16.
8. Find the missing number in the sequence: 16, 21, ____, 31, 36.
9. Find the missing number in the sequence: 19, 24, ____, 34, 39.
10. Find the missing number in the sequence: 1, 3, ____, 7, 9.
11. Find the missing number in the sequence: 18, 19, ____, 21, 22.
12. Find the missing number in the sequence: 11, 12, ____, 14, 15.
12 questions · Seed 104742 · 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: 8, 13, ____, 23, 28.
18The sequence increases by 5 each step: 13 + 5 = 18.
2. Find the missing number in the sequence: 17, 19, ____, 23, 25.
21The sequence increases by 2 each step: 19 + 2 = 21.
3. Find the missing number in the sequence: 3, 4, ____, 6, 7.
5The sequence increases by 1 each step: 4 + 1 = 5.
4. Find the missing number in the sequence: 18, 20, ____, 24, 26.
22The sequence increases by 2 each step: 20 + 2 = 22.
5. Find the missing number in the sequence: 10, 11, ____, 13, 14.
12The sequence increases by 1 each step: 11 + 1 = 12.
6. Find the missing number in the sequence: 13, 15, ____, 19, 21.
17The sequence increases by 2 each step: 15 + 2 = 17.
7. Find the missing number in the sequence: 12, 13, ____, 15, 16.
14The sequence increases by 1 each step: 13 + 1 = 14.
8. Find the missing number in the sequence: 16, 21, ____, 31, 36.
26The sequence increases by 5 each step: 21 + 5 = 26.
9. Find the missing number in the sequence: 19, 24, ____, 34, 39.
29The sequence increases by 5 each step: 24 + 5 = 29.
10. Find the missing number in the sequence: 1, 3, ____, 7, 9.
5The sequence increases by 2 each step: 3 + 2 = 5.
11. Find the missing number in the sequence: 18, 19, ____, 21, 22.
20The sequence increases by 1 each step: 19 + 1 = 20.
12. Find the missing number in the sequence: 11, 12, ____, 14, 15.
13The sequence increases by 1 each step: 12 + 1 = 13.
12 questions · Seed 104742 · Age guidance, not curriculum certification