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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: 17, 19, ____, 23, 25.
2. Find the missing number in the sequence: 8, 10, ____, 14, 16.
3. Find the missing number in the sequence: 19, 20, ____, 22, 23.
4. Find the missing number in the sequence: 10, 11, ____, 13, 14.
5. Find the missing number in the sequence: 2, 7, ____, 17, 22.
6. Find the missing number in the sequence: 13, 18, ____, 28, 33.
7. Find the missing number in the sequence: 9, 10, ____, 12, 13.
8. Find the missing number in the sequence: 16, 21, ____, 31, 36.
9. Find the missing number in the sequence: 8, 13, ____, 23, 28.
10. Find the missing number in the sequence: 19, 21, ____, 25, 27.
11. Find the missing number in the sequence: 12, 14, ____, 18, 20.
12. Find the missing number in the sequence: 17, 18, ____, 20, 21.
12 questions · Seed 104755 · 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: 17, 19, ____, 23, 25.
21The sequence increases by 2 each step: 19 + 2 = 21.
2. Find the missing number in the sequence: 8, 10, ____, 14, 16.
12The sequence increases by 2 each step: 10 + 2 = 12.
3. Find the missing number in the sequence: 19, 20, ____, 22, 23.
21The sequence increases by 1 each step: 20 + 1 = 21.
4. Find the missing number in the sequence: 10, 11, ____, 13, 14.
12The sequence increases by 1 each step: 11 + 1 = 12.
5. Find the missing number in the sequence: 2, 7, ____, 17, 22.
12The sequence increases by 5 each step: 7 + 5 = 12.
6. Find the missing number in the sequence: 13, 18, ____, 28, 33.
23The sequence increases by 5 each step: 18 + 5 = 23.
7. Find the missing number in the sequence: 9, 10, ____, 12, 13.
11The sequence increases by 1 each step: 10 + 1 = 11.
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: 8, 13, ____, 23, 28.
18The sequence increases by 5 each step: 13 + 5 = 18.
10. Find the missing number in the sequence: 19, 21, ____, 25, 27.
23The sequence increases by 2 each step: 21 + 2 = 23.
11. Find the missing number in the sequence: 12, 14, ____, 18, 20.
16The sequence increases by 2 each step: 14 + 2 = 16.
12. Find the missing number in the sequence: 17, 18, ____, 20, 21.
19The sequence increases by 1 each step: 18 + 1 = 19.
12 questions · Seed 104755 · 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: 17, 19, ____, 23, 25.
2. Find the missing number in the sequence: 8, 10, ____, 14, 16.
3. Find the missing number in the sequence: 19, 20, ____, 22, 23.
4. Find the missing number in the sequence: 10, 11, ____, 13, 14.
5. Find the missing number in the sequence: 2, 7, ____, 17, 22.
6. Find the missing number in the sequence: 13, 18, ____, 28, 33.
7. Find the missing number in the sequence: 9, 10, ____, 12, 13.
8. Find the missing number in the sequence: 16, 21, ____, 31, 36.
9. Find the missing number in the sequence: 8, 13, ____, 23, 28.
10. Find the missing number in the sequence: 19, 21, ____, 25, 27.
11. Find the missing number in the sequence: 12, 14, ____, 18, 20.
12. Find the missing number in the sequence: 17, 18, ____, 20, 21.
12 questions · Seed 104755 · 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: 17, 19, ____, 23, 25.
21The sequence increases by 2 each step: 19 + 2 = 21.
2. Find the missing number in the sequence: 8, 10, ____, 14, 16.
12The sequence increases by 2 each step: 10 + 2 = 12.
3. Find the missing number in the sequence: 19, 20, ____, 22, 23.
21The sequence increases by 1 each step: 20 + 1 = 21.
4. Find the missing number in the sequence: 10, 11, ____, 13, 14.
12The sequence increases by 1 each step: 11 + 1 = 12.
5. Find the missing number in the sequence: 2, 7, ____, 17, 22.
12The sequence increases by 5 each step: 7 + 5 = 12.
6. Find the missing number in the sequence: 13, 18, ____, 28, 33.
23The sequence increases by 5 each step: 18 + 5 = 23.
7. Find the missing number in the sequence: 9, 10, ____, 12, 13.
11The sequence increases by 1 each step: 10 + 1 = 11.
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: 8, 13, ____, 23, 28.
18The sequence increases by 5 each step: 13 + 5 = 18.
10. Find the missing number in the sequence: 19, 21, ____, 25, 27.
23The sequence increases by 2 each step: 21 + 2 = 23.
11. Find the missing number in the sequence: 12, 14, ____, 18, 20.
16The sequence increases by 2 each step: 14 + 2 = 16.
12. Find the missing number in the sequence: 17, 18, ____, 20, 21.
19The sequence increases by 1 each step: 18 + 1 = 19.
12 questions · Seed 104755 · Age guidance, not curriculum certification