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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: 15, 16, ____, 18, 19.
2. Find the missing number in the sequence: 11, 16, ____, 26, 31.
3. Find the missing number in the sequence: 17, 18, ____, 20, 21.
4. Find the missing number in the sequence: 13, 18, ____, 28, 33.
5. Find the missing number in the sequence: 5, 10, ____, 20, 25.
6. Find the missing number in the sequence: 4, 5, ____, 7, 8.
7. Find the missing number in the sequence: 14, 16, ____, 20, 22.
8. Find the missing number in the sequence: 18, 19, ____, 21, 22.
9. Find the missing number in the sequence: 11, 12, ____, 14, 15.
10. Find the missing number in the sequence: 5, 6, ____, 8, 9.
11. Find the missing number in the sequence: 19, 24, ____, 34, 39.
12. Find the missing number in the sequence: 12, 14, ____, 18, 20.
12 questions · Seed 92 · 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: 15, 16, ____, 18, 19.
17The sequence increases by 1 each step: 16 + 1 = 17.
2. Find the missing number in the sequence: 11, 16, ____, 26, 31.
21The sequence increases by 5 each step: 16 + 5 = 21.
3. Find the missing number in the sequence: 17, 18, ____, 20, 21.
19The sequence increases by 1 each step: 18 + 1 = 19.
4. Find the missing number in the sequence: 13, 18, ____, 28, 33.
23The sequence increases by 5 each step: 18 + 5 = 23.
5. Find the missing number in the sequence: 5, 10, ____, 20, 25.
15The sequence increases by 5 each step: 10 + 5 = 15.
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: 14, 16, ____, 20, 22.
18The sequence increases by 2 each step: 16 + 2 = 18.
8. Find the missing number in the sequence: 18, 19, ____, 21, 22.
20The sequence increases by 1 each step: 19 + 1 = 20.
9. Find the missing number in the sequence: 11, 12, ____, 14, 15.
13The sequence increases by 1 each step: 12 + 1 = 13.
10. Find the missing number in the sequence: 5, 6, ____, 8, 9.
7The sequence increases by 1 each step: 6 + 1 = 7.
11. Find the missing number in the sequence: 19, 24, ____, 34, 39.
29The sequence increases by 5 each step: 24 + 5 = 29.
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 92 · 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: 15, 16, ____, 18, 19.
2. Find the missing number in the sequence: 11, 16, ____, 26, 31.
3. Find the missing number in the sequence: 17, 18, ____, 20, 21.
4. Find the missing number in the sequence: 13, 18, ____, 28, 33.
5. Find the missing number in the sequence: 5, 10, ____, 20, 25.
6. Find the missing number in the sequence: 4, 5, ____, 7, 8.
7. Find the missing number in the sequence: 14, 16, ____, 20, 22.
8. Find the missing number in the sequence: 18, 19, ____, 21, 22.
9. Find the missing number in the sequence: 11, 12, ____, 14, 15.
10. Find the missing number in the sequence: 5, 6, ____, 8, 9.
11. Find the missing number in the sequence: 19, 24, ____, 34, 39.
12. Find the missing number in the sequence: 12, 14, ____, 18, 20.
12 questions · Seed 92 · 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: 15, 16, ____, 18, 19.
17The sequence increases by 1 each step: 16 + 1 = 17.
2. Find the missing number in the sequence: 11, 16, ____, 26, 31.
21The sequence increases by 5 each step: 16 + 5 = 21.
3. Find the missing number in the sequence: 17, 18, ____, 20, 21.
19The sequence increases by 1 each step: 18 + 1 = 19.
4. Find the missing number in the sequence: 13, 18, ____, 28, 33.
23The sequence increases by 5 each step: 18 + 5 = 23.
5. Find the missing number in the sequence: 5, 10, ____, 20, 25.
15The sequence increases by 5 each step: 10 + 5 = 15.
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: 14, 16, ____, 20, 22.
18The sequence increases by 2 each step: 16 + 2 = 18.
8. Find the missing number in the sequence: 18, 19, ____, 21, 22.
20The sequence increases by 1 each step: 19 + 1 = 20.
9. Find the missing number in the sequence: 11, 12, ____, 14, 15.
13The sequence increases by 1 each step: 12 + 1 = 13.
10. Find the missing number in the sequence: 5, 6, ____, 8, 9.
7The sequence increases by 1 each step: 6 + 1 = 7.
11. Find the missing number in the sequence: 19, 24, ____, 34, 39.
29The sequence increases by 5 each step: 24 + 5 = 29.
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 92 · Age guidance, not curriculum certification