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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: 13, 14, ____, 16, 17.
2. Find the missing number in the sequence: 18, 19, ____, 21, 22.
3. Find the missing number in the sequence: 3, 5, ____, 9, 11.
4. Find the missing number in the sequence: 8, 13, ____, 23, 28.
5. Find the missing number in the sequence: 2, 3, ____, 5, 6.
6. Find the missing number in the sequence: 10, 15, ____, 25, 30.
7. Find the missing number in the sequence: 13, 15, ____, 19, 21.
8. Find the missing number in the sequence: 1, 6, ____, 16, 21.
9. Find the missing number in the sequence: 15, 20, ____, 30, 35.
10. Find the missing number in the sequence: 20, 25, ____, 35, 40.
11. Find the missing number in the sequence: 14, 15, ____, 17, 18.
12. Find the missing number in the sequence: 14, 19, ____, 29, 34.
12 questions · Seed 64 · 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: 13, 14, ____, 16, 17.
15The sequence increases by 1 each step: 14 + 1 = 15.
2. Find the missing number in the sequence: 18, 19, ____, 21, 22.
20The sequence increases by 1 each step: 19 + 1 = 20.
3. Find the missing number in the sequence: 3, 5, ____, 9, 11.
7The sequence increases by 2 each step: 5 + 2 = 7.
4. Find the missing number in the sequence: 8, 13, ____, 23, 28.
18The sequence increases by 5 each step: 13 + 5 = 18.
5. Find the missing number in the sequence: 2, 3, ____, 5, 6.
4The sequence increases by 1 each step: 3 + 1 = 4.
6. Find the missing number in the sequence: 10, 15, ____, 25, 30.
20The sequence increases by 5 each step: 15 + 5 = 20.
7. Find the missing number in the sequence: 13, 15, ____, 19, 21.
17The sequence increases by 2 each step: 15 + 2 = 17.
8. Find the missing number in the sequence: 1, 6, ____, 16, 21.
11The sequence increases by 5 each step: 6 + 5 = 11.
9. Find the missing number in the sequence: 15, 20, ____, 30, 35.
25The sequence increases by 5 each step: 20 + 5 = 25.
10. Find the missing number in the sequence: 20, 25, ____, 35, 40.
30The sequence increases by 5 each step: 25 + 5 = 30.
11. Find the missing number in the sequence: 14, 15, ____, 17, 18.
16The sequence increases by 1 each step: 15 + 1 = 16.
12. Find the missing number in the sequence: 14, 19, ____, 29, 34.
24The sequence increases by 5 each step: 19 + 5 = 24.
12 questions · Seed 64 · 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: 13, 14, ____, 16, 17.
2. Find the missing number in the sequence: 18, 19, ____, 21, 22.
3. Find the missing number in the sequence: 3, 5, ____, 9, 11.
4. Find the missing number in the sequence: 8, 13, ____, 23, 28.
5. Find the missing number in the sequence: 2, 3, ____, 5, 6.
6. Find the missing number in the sequence: 10, 15, ____, 25, 30.
7. Find the missing number in the sequence: 13, 15, ____, 19, 21.
8. Find the missing number in the sequence: 1, 6, ____, 16, 21.
9. Find the missing number in the sequence: 15, 20, ____, 30, 35.
10. Find the missing number in the sequence: 20, 25, ____, 35, 40.
11. Find the missing number in the sequence: 14, 15, ____, 17, 18.
12. Find the missing number in the sequence: 14, 19, ____, 29, 34.
12 questions · Seed 64 · 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: 13, 14, ____, 16, 17.
15The sequence increases by 1 each step: 14 + 1 = 15.
2. Find the missing number in the sequence: 18, 19, ____, 21, 22.
20The sequence increases by 1 each step: 19 + 1 = 20.
3. Find the missing number in the sequence: 3, 5, ____, 9, 11.
7The sequence increases by 2 each step: 5 + 2 = 7.
4. Find the missing number in the sequence: 8, 13, ____, 23, 28.
18The sequence increases by 5 each step: 13 + 5 = 18.
5. Find the missing number in the sequence: 2, 3, ____, 5, 6.
4The sequence increases by 1 each step: 3 + 1 = 4.
6. Find the missing number in the sequence: 10, 15, ____, 25, 30.
20The sequence increases by 5 each step: 15 + 5 = 20.
7. Find the missing number in the sequence: 13, 15, ____, 19, 21.
17The sequence increases by 2 each step: 15 + 2 = 17.
8. Find the missing number in the sequence: 1, 6, ____, 16, 21.
11The sequence increases by 5 each step: 6 + 5 = 11.
9. Find the missing number in the sequence: 15, 20, ____, 30, 35.
25The sequence increases by 5 each step: 20 + 5 = 25.
10. Find the missing number in the sequence: 20, 25, ____, 35, 40.
30The sequence increases by 5 each step: 25 + 5 = 30.
11. Find the missing number in the sequence: 14, 15, ____, 17, 18.
16The sequence increases by 1 each step: 15 + 1 = 16.
12. Find the missing number in the sequence: 14, 19, ____, 29, 34.
24The sequence increases by 5 each step: 19 + 5 = 24.
12 questions · Seed 64 · Age guidance, not curriculum certification