Back to worksheetsReasoningAges 4-6
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: 19, 24, ____, 34, 39.
2. Find the missing number in the sequence: 13, 14, ____, 16, 17.
3. Find the missing number in the sequence: 1, 6, ____, 16, 21.
4. Find the missing number in the sequence: 3, 5, ____, 9, 11.
5. Find the missing number in the sequence: 9, 10, ____, 12, 13.
6. Find the missing number in the sequence: 12, 14, ____, 18, 20.
7. Find the missing number in the sequence: 15, 17, ____, 21, 23.
8. Find the missing number in the sequence: 8, 13, ____, 23, 28.
9. Find the missing number in the sequence: 5, 10, ____, 20, 25.
10. Find the missing number in the sequence: 17, 22, ____, 32, 37.
11. Find the missing number in the sequence: 2, 7, ____, 17, 22.
12. Find the missing number in the sequence: 19, 21, ____, 25, 27.
12 questions · Seed 90 · 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: 19, 24, ____, 34, 39.
29The sequence increases by 5 each step: 24 + 5 = 29.
2. Find the missing number in the sequence: 13, 14, ____, 16, 17.
15The sequence increases by 1 each step: 14 + 1 = 15.
3. Find the missing number in the sequence: 1, 6, ____, 16, 21.
11The sequence increases by 5 each step: 6 + 5 = 11.
4. Find the missing number in the sequence: 3, 5, ____, 9, 11.
7The sequence increases by 2 each step: 5 + 2 = 7.
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: 12, 14, ____, 18, 20.
16The sequence increases by 2 each step: 14 + 2 = 16.
7. Find the missing number in the sequence: 15, 17, ____, 21, 23.
19The sequence increases by 2 each step: 17 + 2 = 19.
8. Find the missing number in the sequence: 8, 13, ____, 23, 28.
18The sequence increases by 5 each step: 13 + 5 = 18.
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: 17, 22, ____, 32, 37.
27The sequence increases by 5 each step: 22 + 5 = 27.
11. Find the missing number in the sequence: 2, 7, ____, 17, 22.
12The sequence increases by 5 each step: 7 + 5 = 12.
12. Find the missing number in the sequence: 19, 21, ____, 25, 27.
23The sequence increases by 2 each step: 21 + 2 = 23.
12 questions · Seed 90 · 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: 19, 24, ____, 34, 39.
2. Find the missing number in the sequence: 13, 14, ____, 16, 17.
3. Find the missing number in the sequence: 1, 6, ____, 16, 21.
4. Find the missing number in the sequence: 3, 5, ____, 9, 11.
5. Find the missing number in the sequence: 9, 10, ____, 12, 13.
6. Find the missing number in the sequence: 12, 14, ____, 18, 20.
7. Find the missing number in the sequence: 15, 17, ____, 21, 23.
8. Find the missing number in the sequence: 8, 13, ____, 23, 28.
9. Find the missing number in the sequence: 5, 10, ____, 20, 25.
10. Find the missing number in the sequence: 17, 22, ____, 32, 37.
11. Find the missing number in the sequence: 2, 7, ____, 17, 22.
12. Find the missing number in the sequence: 19, 21, ____, 25, 27.
12 questions · Seed 90 · 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: 19, 24, ____, 34, 39.
29The sequence increases by 5 each step: 24 + 5 = 29.
2. Find the missing number in the sequence: 13, 14, ____, 16, 17.
15The sequence increases by 1 each step: 14 + 1 = 15.
3. Find the missing number in the sequence: 1, 6, ____, 16, 21.
11The sequence increases by 5 each step: 6 + 5 = 11.
4. Find the missing number in the sequence: 3, 5, ____, 9, 11.
7The sequence increases by 2 each step: 5 + 2 = 7.
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: 12, 14, ____, 18, 20.
16The sequence increases by 2 each step: 14 + 2 = 16.
7. Find the missing number in the sequence: 15, 17, ____, 21, 23.
19The sequence increases by 2 each step: 17 + 2 = 19.
8. Find the missing number in the sequence: 8, 13, ____, 23, 28.
18The sequence increases by 5 each step: 13 + 5 = 18.
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: 17, 22, ____, 32, 37.
27The sequence increases by 5 each step: 22 + 5 = 27.
11. Find the missing number in the sequence: 2, 7, ____, 17, 22.
12The sequence increases by 5 each step: 7 + 5 = 12.
12. Find the missing number in the sequence: 19, 21, ____, 25, 27.
23The sequence increases by 2 each step: 21 + 2 = 23.
12 questions · Seed 90 · Age guidance, not curriculum certification