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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: 6, 7, ____, 9, 10.
2. Find the missing number in the sequence: 13, 15, ____, 19, 21.
3. Find the missing number in the sequence: 3, 4, ____, 6, 7.
4. Find the missing number in the sequence: 10, 15, ____, 25, 30.
5. Find the missing number in the sequence: 17, 19, ____, 23, 25.
6. Find the missing number in the sequence: 4, 5, ____, 7, 8.
7. Find the missing number in the sequence: 1, 3, ____, 7, 9.
8. Find the missing number in the sequence: 13, 18, ____, 28, 33.
9. Find the missing number in the sequence: 11, 13, ____, 17, 19.
10. Find the missing number in the sequence: 9, 10, ____, 12, 13.
11. Find the missing number in the sequence: 12, 14, ____, 18, 20.
12. Find the missing number in the sequence: 14, 16, ____, 20, 22.
12 questions · Seed 98 · 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: 6, 7, ____, 9, 10.
8The sequence increases by 1 each step: 7 + 1 = 8.
2. Find the missing number in the sequence: 13, 15, ____, 19, 21.
17The sequence increases by 2 each step: 15 + 2 = 17.
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: 10, 15, ____, 25, 30.
20The sequence increases by 5 each step: 15 + 5 = 20.
5. Find the missing number in the sequence: 17, 19, ____, 23, 25.
21The sequence increases by 2 each step: 19 + 2 = 21.
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: 1, 3, ____, 7, 9.
5The sequence increases by 2 each step: 3 + 2 = 5.
8. Find the missing number in the sequence: 13, 18, ____, 28, 33.
23The sequence increases by 5 each step: 18 + 5 = 23.
9. Find the missing number in the sequence: 11, 13, ____, 17, 19.
15The sequence increases by 2 each step: 13 + 2 = 15.
10. Find the missing number in the sequence: 9, 10, ____, 12, 13.
11The sequence increases by 1 each step: 10 + 1 = 11.
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: 14, 16, ____, 20, 22.
18The sequence increases by 2 each step: 16 + 2 = 18.
12 questions · Seed 98 · 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: 6, 7, ____, 9, 10.
2. Find the missing number in the sequence: 13, 15, ____, 19, 21.
3. Find the missing number in the sequence: 3, 4, ____, 6, 7.
4. Find the missing number in the sequence: 10, 15, ____, 25, 30.
5. Find the missing number in the sequence: 17, 19, ____, 23, 25.
6. Find the missing number in the sequence: 4, 5, ____, 7, 8.
7. Find the missing number in the sequence: 1, 3, ____, 7, 9.
8. Find the missing number in the sequence: 13, 18, ____, 28, 33.
9. Find the missing number in the sequence: 11, 13, ____, 17, 19.
10. Find the missing number in the sequence: 9, 10, ____, 12, 13.
11. Find the missing number in the sequence: 12, 14, ____, 18, 20.
12. Find the missing number in the sequence: 14, 16, ____, 20, 22.
12 questions · Seed 98 · 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: 6, 7, ____, 9, 10.
8The sequence increases by 1 each step: 7 + 1 = 8.
2. Find the missing number in the sequence: 13, 15, ____, 19, 21.
17The sequence increases by 2 each step: 15 + 2 = 17.
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: 10, 15, ____, 25, 30.
20The sequence increases by 5 each step: 15 + 5 = 20.
5. Find the missing number in the sequence: 17, 19, ____, 23, 25.
21The sequence increases by 2 each step: 19 + 2 = 21.
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: 1, 3, ____, 7, 9.
5The sequence increases by 2 each step: 3 + 2 = 5.
8. Find the missing number in the sequence: 13, 18, ____, 28, 33.
23The sequence increases by 5 each step: 18 + 5 = 23.
9. Find the missing number in the sequence: 11, 13, ____, 17, 19.
15The sequence increases by 2 each step: 13 + 2 = 15.
10. Find the missing number in the sequence: 9, 10, ____, 12, 13.
11The sequence increases by 1 each step: 10 + 1 = 11.
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: 14, 16, ____, 20, 22.
18The sequence increases by 2 each step: 16 + 2 = 18.
12 questions · Seed 98 · Age guidance, not curriculum certification