Back to worksheetsReasoningAges 7-9
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 7-9
Missing sequence terms
Take your time. Show your thinking.
1. Find the missing number in the sequence: 19, 29, ____, 49, 59.
2. Find the missing number in the sequence: 20, 28, ____, 44, 52.
3. Find the missing number in the sequence: 7, 17, ____, 37, 47.
4. Find the missing number in the sequence: 4, 8, ____, 16, 20.
5. Find the missing number in the sequence: 20, 27, ____, 41, 48.
6. Find the missing number in the sequence: 3, 6, ____, 12, 15.
7. Find the missing number in the sequence: 10, 16, ____, 28, 34.
8. Find the missing number in the sequence: 4, 11, ____, 25, 32.
9. Find the missing number in the sequence: 15, 23, ____, 39, 47.
10. Find the missing number in the sequence: 15, 25, ____, 45, 55.
11. Find the missing number in the sequence: 3, 11, ____, 27, 35.
12. Find the missing number in the sequence: 14, 21, ____, 35, 42.
12 questions · Seed 104743 · Age guidance, not curriculum certification
View the answer key
Worksheet StudioAnswer key · Ages 7-9
Missing sequence terms
Answers and reasoning. Review before teaching.
1. Find the missing number in the sequence: 19, 29, ____, 49, 59.
39The sequence increases by 10 each step: 29 + 10 = 39.
2. Find the missing number in the sequence: 20, 28, ____, 44, 52.
36The sequence increases by 8 each step: 28 + 8 = 36.
3. Find the missing number in the sequence: 7, 17, ____, 37, 47.
27The sequence increases by 10 each step: 17 + 10 = 27.
4. Find the missing number in the sequence: 4, 8, ____, 16, 20.
12The sequence increases by 4 each step: 8 + 4 = 12.
5. Find the missing number in the sequence: 20, 27, ____, 41, 48.
34The sequence increases by 7 each step: 27 + 7 = 34.
6. Find the missing number in the sequence: 3, 6, ____, 12, 15.
9The sequence increases by 3 each step: 6 + 3 = 9.
7. Find the missing number in the sequence: 10, 16, ____, 28, 34.
22The sequence increases by 6 each step: 16 + 6 = 22.
8. Find the missing number in the sequence: 4, 11, ____, 25, 32.
18The sequence increases by 7 each step: 11 + 7 = 18.
9. Find the missing number in the sequence: 15, 23, ____, 39, 47.
31The sequence increases by 8 each step: 23 + 8 = 31.
10. Find the missing number in the sequence: 15, 25, ____, 45, 55.
35The sequence increases by 10 each step: 25 + 10 = 35.
11. Find the missing number in the sequence: 3, 11, ____, 27, 35.
19The sequence increases by 8 each step: 11 + 8 = 19.
12. Find the missing number in the sequence: 14, 21, ____, 35, 42.
28The sequence increases by 7 each step: 21 + 7 = 28.
12 questions · Seed 104743 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 7-9
Missing sequence terms
Take your time. Show your thinking.
1. Find the missing number in the sequence: 19, 29, ____, 49, 59.
2. Find the missing number in the sequence: 20, 28, ____, 44, 52.
3. Find the missing number in the sequence: 7, 17, ____, 37, 47.
4. Find the missing number in the sequence: 4, 8, ____, 16, 20.
5. Find the missing number in the sequence: 20, 27, ____, 41, 48.
6. Find the missing number in the sequence: 3, 6, ____, 12, 15.
7. Find the missing number in the sequence: 10, 16, ____, 28, 34.
8. Find the missing number in the sequence: 4, 11, ____, 25, 32.
9. Find the missing number in the sequence: 15, 23, ____, 39, 47.
10. Find the missing number in the sequence: 15, 25, ____, 45, 55.
11. Find the missing number in the sequence: 3, 11, ____, 27, 35.
12. Find the missing number in the sequence: 14, 21, ____, 35, 42.
12 questions · Seed 104743 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 7-9
Missing sequence terms
Answers and reasoning. Review before teaching.
1. Find the missing number in the sequence: 19, 29, ____, 49, 59.
39The sequence increases by 10 each step: 29 + 10 = 39.
2. Find the missing number in the sequence: 20, 28, ____, 44, 52.
36The sequence increases by 8 each step: 28 + 8 = 36.
3. Find the missing number in the sequence: 7, 17, ____, 37, 47.
27The sequence increases by 10 each step: 17 + 10 = 27.
4. Find the missing number in the sequence: 4, 8, ____, 16, 20.
12The sequence increases by 4 each step: 8 + 4 = 12.
5. Find the missing number in the sequence: 20, 27, ____, 41, 48.
34The sequence increases by 7 each step: 27 + 7 = 34.
6. Find the missing number in the sequence: 3, 6, ____, 12, 15.
9The sequence increases by 3 each step: 6 + 3 = 9.
7. Find the missing number in the sequence: 10, 16, ____, 28, 34.
22The sequence increases by 6 each step: 16 + 6 = 22.
8. Find the missing number in the sequence: 4, 11, ____, 25, 32.
18The sequence increases by 7 each step: 11 + 7 = 18.
9. Find the missing number in the sequence: 15, 23, ____, 39, 47.
31The sequence increases by 8 each step: 23 + 8 = 31.
10. Find the missing number in the sequence: 15, 25, ____, 45, 55.
35The sequence increases by 10 each step: 25 + 10 = 35.
11. Find the missing number in the sequence: 3, 11, ____, 27, 35.
19The sequence increases by 8 each step: 11 + 8 = 19.
12. Find the missing number in the sequence: 14, 21, ____, 35, 42.
28The sequence increases by 7 each step: 21 + 7 = 28.
12 questions · Seed 104743 · Age guidance, not curriculum certification