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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: 16, 17, ____, 19, 20.
2. Find the missing number in the sequence: 7, 9, ____, 13, 15.
3. Find the missing number in the sequence: 15, 16, ____, 18, 19.
4. Find the missing number in the sequence: 18, 20, ____, 24, 26.
5. Find the missing number in the sequence: 9, 10, ____, 12, 13.
6. Find the missing number in the sequence: 11, 12, ____, 14, 15.
7. Find the missing number in the sequence: 10, 15, ____, 25, 30.
8. Find the missing number in the sequence: 9, 11, ____, 15, 17.
9. Find the missing number in the sequence: 5, 10, ____, 20, 25.
10. Find the missing number in the sequence: 13, 18, ____, 28, 33.
11. Find the missing number in the sequence: 8, 13, ____, 23, 28.
12. Find the missing number in the sequence: 5, 6, ____, 8, 9.
12 questions · Seed 104749 · 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: 16, 17, ____, 19, 20.
18The sequence increases by 1 each step: 17 + 1 = 18.
2. Find the missing number in the sequence: 7, 9, ____, 13, 15.
11The sequence increases by 2 each step: 9 + 2 = 11.
3. Find the missing number in the sequence: 15, 16, ____, 18, 19.
17The sequence increases by 1 each step: 16 + 1 = 17.
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: 9, 10, ____, 12, 13.
11The sequence increases by 1 each step: 10 + 1 = 11.
6. Find the missing number in the sequence: 11, 12, ____, 14, 15.
13The sequence increases by 1 each step: 12 + 1 = 13.
7. Find the missing number in the sequence: 10, 15, ____, 25, 30.
20The sequence increases by 5 each step: 15 + 5 = 20.
8. Find the missing number in the sequence: 9, 11, ____, 15, 17.
13The sequence increases by 2 each step: 11 + 2 = 13.
9. Find the missing number in the sequence: 5, 10, ____, 20, 25.
15The sequence increases by 5 each step: 10 + 5 = 15.
10. Find the missing number in the sequence: 13, 18, ____, 28, 33.
23The sequence increases by 5 each step: 18 + 5 = 23.
11. Find the missing number in the sequence: 8, 13, ____, 23, 28.
18The sequence increases by 5 each step: 13 + 5 = 18.
12. Find the missing number in the sequence: 5, 6, ____, 8, 9.
7The sequence increases by 1 each step: 6 + 1 = 7.
12 questions · Seed 104749 · 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: 16, 17, ____, 19, 20.
2. Find the missing number in the sequence: 7, 9, ____, 13, 15.
3. Find the missing number in the sequence: 15, 16, ____, 18, 19.
4. Find the missing number in the sequence: 18, 20, ____, 24, 26.
5. Find the missing number in the sequence: 9, 10, ____, 12, 13.
6. Find the missing number in the sequence: 11, 12, ____, 14, 15.
7. Find the missing number in the sequence: 10, 15, ____, 25, 30.
8. Find the missing number in the sequence: 9, 11, ____, 15, 17.
9. Find the missing number in the sequence: 5, 10, ____, 20, 25.
10. Find the missing number in the sequence: 13, 18, ____, 28, 33.
11. Find the missing number in the sequence: 8, 13, ____, 23, 28.
12. Find the missing number in the sequence: 5, 6, ____, 8, 9.
12 questions · Seed 104749 · 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: 16, 17, ____, 19, 20.
18The sequence increases by 1 each step: 17 + 1 = 18.
2. Find the missing number in the sequence: 7, 9, ____, 13, 15.
11The sequence increases by 2 each step: 9 + 2 = 11.
3. Find the missing number in the sequence: 15, 16, ____, 18, 19.
17The sequence increases by 1 each step: 16 + 1 = 17.
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: 9, 10, ____, 12, 13.
11The sequence increases by 1 each step: 10 + 1 = 11.
6. Find the missing number in the sequence: 11, 12, ____, 14, 15.
13The sequence increases by 1 each step: 12 + 1 = 13.
7. Find the missing number in the sequence: 10, 15, ____, 25, 30.
20The sequence increases by 5 each step: 15 + 5 = 20.
8. Find the missing number in the sequence: 9, 11, ____, 15, 17.
13The sequence increases by 2 each step: 11 + 2 = 13.
9. Find the missing number in the sequence: 5, 10, ____, 20, 25.
15The sequence increases by 5 each step: 10 + 5 = 15.
10. Find the missing number in the sequence: 13, 18, ____, 28, 33.
23The sequence increases by 5 each step: 18 + 5 = 23.
11. Find the missing number in the sequence: 8, 13, ____, 23, 28.
18The sequence increases by 5 each step: 13 + 5 = 18.
12. Find the missing number in the sequence: 5, 6, ____, 8, 9.
7The sequence increases by 1 each step: 6 + 1 = 7.
12 questions · Seed 104749 · Age guidance, not curriculum certification