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: 6, 12, ____, 24, 30.
2. Find the missing number in the sequence: 6, 9, ____, 15, 18.
3. Find the missing number in the sequence: 20, 29, ____, 47, 56.
4. Find the missing number in the sequence: 8, 12, ____, 20, 24.
5. Find the missing number in the sequence: 4, 11, ____, 25, 32.
6. Find the missing number in the sequence: 10, 14, ____, 22, 26.
7. Find the missing number in the sequence: 15, 23, ____, 39, 47.
8. Find the missing number in the sequence: 11, 15, ____, 23, 27.
9. Find the missing number in the sequence: 17, 25, ____, 41, 49.
10. Find the missing number in the sequence: 3, 9, ____, 21, 27.
11. Find the missing number in the sequence: 7, 14, ____, 28, 35.
12. Find the missing number in the sequence: 18, 24, ____, 36, 42.
12 questions · Seed 104735 · 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: 6, 12, ____, 24, 30.
18The sequence increases by 6 each step: 12 + 6 = 18.
2. Find the missing number in the sequence: 6, 9, ____, 15, 18.
12The sequence increases by 3 each step: 9 + 3 = 12.
3. Find the missing number in the sequence: 20, 29, ____, 47, 56.
38The sequence increases by 9 each step: 29 + 9 = 38.
4. Find the missing number in the sequence: 8, 12, ____, 20, 24.
16The sequence increases by 4 each step: 12 + 4 = 16.
5. Find the missing number in the sequence: 4, 11, ____, 25, 32.
18The sequence increases by 7 each step: 11 + 7 = 18.
6. Find the missing number in the sequence: 10, 14, ____, 22, 26.
18The sequence increases by 4 each step: 14 + 4 = 18.
7. Find the missing number in the sequence: 15, 23, ____, 39, 47.
31The sequence increases by 8 each step: 23 + 8 = 31.
8. Find the missing number in the sequence: 11, 15, ____, 23, 27.
19The sequence increases by 4 each step: 15 + 4 = 19.
9. Find the missing number in the sequence: 17, 25, ____, 41, 49.
33The sequence increases by 8 each step: 25 + 8 = 33.
10. Find the missing number in the sequence: 3, 9, ____, 21, 27.
15The sequence increases by 6 each step: 9 + 6 = 15.
11. Find the missing number in the sequence: 7, 14, ____, 28, 35.
21The sequence increases by 7 each step: 14 + 7 = 21.
12. Find the missing number in the sequence: 18, 24, ____, 36, 42.
30The sequence increases by 6 each step: 24 + 6 = 30.
12 questions · Seed 104735 · 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: 6, 12, ____, 24, 30.
2. Find the missing number in the sequence: 6, 9, ____, 15, 18.
3. Find the missing number in the sequence: 20, 29, ____, 47, 56.
4. Find the missing number in the sequence: 8, 12, ____, 20, 24.
5. Find the missing number in the sequence: 4, 11, ____, 25, 32.
6. Find the missing number in the sequence: 10, 14, ____, 22, 26.
7. Find the missing number in the sequence: 15, 23, ____, 39, 47.
8. Find the missing number in the sequence: 11, 15, ____, 23, 27.
9. Find the missing number in the sequence: 17, 25, ____, 41, 49.
10. Find the missing number in the sequence: 3, 9, ____, 21, 27.
11. Find the missing number in the sequence: 7, 14, ____, 28, 35.
12. Find the missing number in the sequence: 18, 24, ____, 36, 42.
12 questions · Seed 104735 · 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: 6, 12, ____, 24, 30.
18The sequence increases by 6 each step: 12 + 6 = 18.
2. Find the missing number in the sequence: 6, 9, ____, 15, 18.
12The sequence increases by 3 each step: 9 + 3 = 12.
3. Find the missing number in the sequence: 20, 29, ____, 47, 56.
38The sequence increases by 9 each step: 29 + 9 = 38.
4. Find the missing number in the sequence: 8, 12, ____, 20, 24.
16The sequence increases by 4 each step: 12 + 4 = 16.
5. Find the missing number in the sequence: 4, 11, ____, 25, 32.
18The sequence increases by 7 each step: 11 + 7 = 18.
6. Find the missing number in the sequence: 10, 14, ____, 22, 26.
18The sequence increases by 4 each step: 14 + 4 = 18.
7. Find the missing number in the sequence: 15, 23, ____, 39, 47.
31The sequence increases by 8 each step: 23 + 8 = 31.
8. Find the missing number in the sequence: 11, 15, ____, 23, 27.
19The sequence increases by 4 each step: 15 + 4 = 19.
9. Find the missing number in the sequence: 17, 25, ____, 41, 49.
33The sequence increases by 8 each step: 25 + 8 = 33.
10. Find the missing number in the sequence: 3, 9, ____, 21, 27.
15The sequence increases by 6 each step: 9 + 6 = 15.
11. Find the missing number in the sequence: 7, 14, ____, 28, 35.
21The sequence increases by 7 each step: 14 + 7 = 21.
12. Find the missing number in the sequence: 18, 24, ____, 36, 42.
30The sequence increases by 6 each step: 24 + 6 = 30.
12 questions · Seed 104735 · Age guidance, not curriculum certification