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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, 18, ____, 20, 21.
2. Find the missing number in the sequence: 17, 22, ____, 32, 37.
3. Find the missing number in the sequence: 4, 6, ____, 10, 12.
4. Find the missing number in the sequence: 19, 21, ____, 25, 27.
5. Find the missing number in the sequence: 2, 4, ____, 8, 10.
6. Find the missing number in the sequence: 7, 12, ____, 22, 27.
7. Find the missing number in the sequence: 4, 5, ____, 7, 8.
8. Find the missing number in the sequence: 20, 22, ____, 26, 28.
9. Find the missing number in the sequence: 16, 17, ____, 19, 20.
10. Find the missing number in the sequence: 3, 4, ____, 6, 7.
11. Find the missing number in the sequence: 7, 9, ____, 13, 15.
12. Find the missing number in the sequence: 12, 14, ____, 18, 20.
12 questions · Seed 104734 · 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, 18, ____, 20, 21.
19The sequence increases by 1 each step: 18 + 1 = 19.
2. Find the missing number in the sequence: 17, 22, ____, 32, 37.
27The sequence increases by 5 each step: 22 + 5 = 27.
3. Find the missing number in the sequence: 4, 6, ____, 10, 12.
8The sequence increases by 2 each step: 6 + 2 = 8.
4. Find the missing number in the sequence: 19, 21, ____, 25, 27.
23The sequence increases by 2 each step: 21 + 2 = 23.
5. Find the missing number in the sequence: 2, 4, ____, 8, 10.
6The sequence increases by 2 each step: 4 + 2 = 6.
6. Find the missing number in the sequence: 7, 12, ____, 22, 27.
17The sequence increases by 5 each step: 12 + 5 = 17.
7. Find the missing number in the sequence: 4, 5, ____, 7, 8.
6The sequence increases by 1 each step: 5 + 1 = 6.
8. Find the missing number in the sequence: 20, 22, ____, 26, 28.
24The sequence increases by 2 each step: 22 + 2 = 24.
9. Find the missing number in the sequence: 16, 17, ____, 19, 20.
18The sequence increases by 1 each step: 17 + 1 = 18.
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: 7, 9, ____, 13, 15.
11The sequence increases by 2 each step: 9 + 2 = 11.
12. Find the missing number in the sequence: 12, 14, ____, 18, 20.
16The sequence increases by 2 each step: 14 + 2 = 16.
12 questions · Seed 104734 · 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, 18, ____, 20, 21.
2. Find the missing number in the sequence: 17, 22, ____, 32, 37.
3. Find the missing number in the sequence: 4, 6, ____, 10, 12.
4. Find the missing number in the sequence: 19, 21, ____, 25, 27.
5. Find the missing number in the sequence: 2, 4, ____, 8, 10.
6. Find the missing number in the sequence: 7, 12, ____, 22, 27.
7. Find the missing number in the sequence: 4, 5, ____, 7, 8.
8. Find the missing number in the sequence: 20, 22, ____, 26, 28.
9. Find the missing number in the sequence: 16, 17, ____, 19, 20.
10. Find the missing number in the sequence: 3, 4, ____, 6, 7.
11. Find the missing number in the sequence: 7, 9, ____, 13, 15.
12. Find the missing number in the sequence: 12, 14, ____, 18, 20.
12 questions · Seed 104734 · 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, 18, ____, 20, 21.
19The sequence increases by 1 each step: 18 + 1 = 19.
2. Find the missing number in the sequence: 17, 22, ____, 32, 37.
27The sequence increases by 5 each step: 22 + 5 = 27.
3. Find the missing number in the sequence: 4, 6, ____, 10, 12.
8The sequence increases by 2 each step: 6 + 2 = 8.
4. Find the missing number in the sequence: 19, 21, ____, 25, 27.
23The sequence increases by 2 each step: 21 + 2 = 23.
5. Find the missing number in the sequence: 2, 4, ____, 8, 10.
6The sequence increases by 2 each step: 4 + 2 = 6.
6. Find the missing number in the sequence: 7, 12, ____, 22, 27.
17The sequence increases by 5 each step: 12 + 5 = 17.
7. Find the missing number in the sequence: 4, 5, ____, 7, 8.
6The sequence increases by 1 each step: 5 + 1 = 6.
8. Find the missing number in the sequence: 20, 22, ____, 26, 28.
24The sequence increases by 2 each step: 22 + 2 = 24.
9. Find the missing number in the sequence: 16, 17, ____, 19, 20.
18The sequence increases by 1 each step: 17 + 1 = 18.
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: 7, 9, ____, 13, 15.
11The sequence increases by 2 each step: 9 + 2 = 11.
12. Find the missing number in the sequence: 12, 14, ____, 18, 20.
16The sequence increases by 2 each step: 14 + 2 = 16.
12 questions · Seed 104734 · Age guidance, not curriculum certification