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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 7-9
Missing sequence terms
Take your time. Show your thinking.
1. Find the missing number in the sequence: 19, 23, ____, 31, 35.
2. Find the missing number in the sequence: 15, 22, ____, 36, 43.
3. Find the missing number in the sequence: 2, 5, ____, 11, 14.
4. Find the missing number in the sequence: 6, 9, ____, 15, 18.
5. Find the missing number in the sequence: 12, 15, ____, 21, 24.
6. Find the missing number in the sequence: 11, 21, ____, 41, 51.
7. Find the missing number in the sequence: 11, 19, ____, 35, 43.
8. Find the missing number in the sequence: 10, 14, ____, 22, 26.
9. Find the missing number in the sequence: 9, 19, ____, 39, 49.
10. Find the missing number in the sequence: 18, 25, ____, 39, 46.
11. Find the missing number in the sequence: 15, 25, ____, 45, 55.
12. Find the missing number in the sequence: 9, 12, ____, 18, 21.
12 questions · Seed 104753 · 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, 23, ____, 31, 35.
27The sequence increases by 4 each step: 23 + 4 = 27.
2. Find the missing number in the sequence: 15, 22, ____, 36, 43.
29The sequence increases by 7 each step: 22 + 7 = 29.
3. Find the missing number in the sequence: 2, 5, ____, 11, 14.
8The sequence increases by 3 each step: 5 + 3 = 8.
4. Find the missing number in the sequence: 6, 9, ____, 15, 18.
12The sequence increases by 3 each step: 9 + 3 = 12.
5. Find the missing number in the sequence: 12, 15, ____, 21, 24.
18The sequence increases by 3 each step: 15 + 3 = 18.
6. Find the missing number in the sequence: 11, 21, ____, 41, 51.
31The sequence increases by 10 each step: 21 + 10 = 31.
7. Find the missing number in the sequence: 11, 19, ____, 35, 43.
27The sequence increases by 8 each step: 19 + 8 = 27.
8. Find the missing number in the sequence: 10, 14, ____, 22, 26.
18The sequence increases by 4 each step: 14 + 4 = 18.
9. Find the missing number in the sequence: 9, 19, ____, 39, 49.
29The sequence increases by 10 each step: 19 + 10 = 29.
10. Find the missing number in the sequence: 18, 25, ____, 39, 46.
32The sequence increases by 7 each step: 25 + 7 = 32.
11. Find the missing number in the sequence: 15, 25, ____, 45, 55.
35The sequence increases by 10 each step: 25 + 10 = 35.
12. Find the missing number in the sequence: 9, 12, ____, 18, 21.
15The sequence increases by 3 each step: 12 + 3 = 15.
12 questions · Seed 104753 · 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, 23, ____, 31, 35.
2. Find the missing number in the sequence: 15, 22, ____, 36, 43.
3. Find the missing number in the sequence: 2, 5, ____, 11, 14.
4. Find the missing number in the sequence: 6, 9, ____, 15, 18.
5. Find the missing number in the sequence: 12, 15, ____, 21, 24.
6. Find the missing number in the sequence: 11, 21, ____, 41, 51.
7. Find the missing number in the sequence: 11, 19, ____, 35, 43.
8. Find the missing number in the sequence: 10, 14, ____, 22, 26.
9. Find the missing number in the sequence: 9, 19, ____, 39, 49.
10. Find the missing number in the sequence: 18, 25, ____, 39, 46.
11. Find the missing number in the sequence: 15, 25, ____, 45, 55.
12. Find the missing number in the sequence: 9, 12, ____, 18, 21.
12 questions · Seed 104753 · 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, 23, ____, 31, 35.
27The sequence increases by 4 each step: 23 + 4 = 27.
2. Find the missing number in the sequence: 15, 22, ____, 36, 43.
29The sequence increases by 7 each step: 22 + 7 = 29.
3. Find the missing number in the sequence: 2, 5, ____, 11, 14.
8The sequence increases by 3 each step: 5 + 3 = 8.
4. Find the missing number in the sequence: 6, 9, ____, 15, 18.
12The sequence increases by 3 each step: 9 + 3 = 12.
5. Find the missing number in the sequence: 12, 15, ____, 21, 24.
18The sequence increases by 3 each step: 15 + 3 = 18.
6. Find the missing number in the sequence: 11, 21, ____, 41, 51.
31The sequence increases by 10 each step: 21 + 10 = 31.
7. Find the missing number in the sequence: 11, 19, ____, 35, 43.
27The sequence increases by 8 each step: 19 + 8 = 27.
8. Find the missing number in the sequence: 10, 14, ____, 22, 26.
18The sequence increases by 4 each step: 14 + 4 = 18.
9. Find the missing number in the sequence: 9, 19, ____, 39, 49.
29The sequence increases by 10 each step: 19 + 10 = 29.
10. Find the missing number in the sequence: 18, 25, ____, 39, 46.
32The sequence increases by 7 each step: 25 + 7 = 32.
11. Find the missing number in the sequence: 15, 25, ____, 45, 55.
35The sequence increases by 10 each step: 25 + 10 = 35.
12. Find the missing number in the sequence: 9, 12, ____, 18, 21.
15The sequence increases by 3 each step: 12 + 3 = 15.
12 questions · Seed 104753 · Age guidance, not curriculum certification