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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: 7, 11, ____, 19, 23.
2. Find the missing number in the sequence: 11, 20, ____, 38, 47.
3. Find the missing number in the sequence: 2, 6, ____, 14, 18.
4. Find the missing number in the sequence: 11, 14, ____, 20, 23.
5. Find the missing number in the sequence: 11, 17, ____, 29, 35.
6. Find the missing number in the sequence: 7, 15, ____, 31, 39.
7. Find the missing number in the sequence: 12, 20, ____, 36, 44.
8. Find the missing number in the sequence: 2, 10, ____, 26, 34.
9. Find the missing number in the sequence: 6, 13, ____, 27, 34.
10. Find the missing number in the sequence: 17, 25, ____, 41, 49.
11. Find the missing number in the sequence: 7, 13, ____, 25, 31.
12. Find the missing number in the sequence: 10, 13, ____, 19, 22.
12 questions · Seed 104733 · 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: 7, 11, ____, 19, 23.
15The sequence increases by 4 each step: 11 + 4 = 15.
2. Find the missing number in the sequence: 11, 20, ____, 38, 47.
29The sequence increases by 9 each step: 20 + 9 = 29.
3. Find the missing number in the sequence: 2, 6, ____, 14, 18.
10The sequence increases by 4 each step: 6 + 4 = 10.
4. Find the missing number in the sequence: 11, 14, ____, 20, 23.
17The sequence increases by 3 each step: 14 + 3 = 17.
5. Find the missing number in the sequence: 11, 17, ____, 29, 35.
23The sequence increases by 6 each step: 17 + 6 = 23.
6. Find the missing number in the sequence: 7, 15, ____, 31, 39.
23The sequence increases by 8 each step: 15 + 8 = 23.
7. Find the missing number in the sequence: 12, 20, ____, 36, 44.
28The sequence increases by 8 each step: 20 + 8 = 28.
8. Find the missing number in the sequence: 2, 10, ____, 26, 34.
18The sequence increases by 8 each step: 10 + 8 = 18.
9. Find the missing number in the sequence: 6, 13, ____, 27, 34.
20The sequence increases by 7 each step: 13 + 7 = 20.
10. Find the missing number in the sequence: 17, 25, ____, 41, 49.
33The sequence increases by 8 each step: 25 + 8 = 33.
11. Find the missing number in the sequence: 7, 13, ____, 25, 31.
19The sequence increases by 6 each step: 13 + 6 = 19.
12. Find the missing number in the sequence: 10, 13, ____, 19, 22.
16The sequence increases by 3 each step: 13 + 3 = 16.
12 questions · Seed 104733 · 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: 7, 11, ____, 19, 23.
2. Find the missing number in the sequence: 11, 20, ____, 38, 47.
3. Find the missing number in the sequence: 2, 6, ____, 14, 18.
4. Find the missing number in the sequence: 11, 14, ____, 20, 23.
5. Find the missing number in the sequence: 11, 17, ____, 29, 35.
6. Find the missing number in the sequence: 7, 15, ____, 31, 39.
7. Find the missing number in the sequence: 12, 20, ____, 36, 44.
8. Find the missing number in the sequence: 2, 10, ____, 26, 34.
9. Find the missing number in the sequence: 6, 13, ____, 27, 34.
10. Find the missing number in the sequence: 17, 25, ____, 41, 49.
11. Find the missing number in the sequence: 7, 13, ____, 25, 31.
12. Find the missing number in the sequence: 10, 13, ____, 19, 22.
12 questions · Seed 104733 · 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: 7, 11, ____, 19, 23.
15The sequence increases by 4 each step: 11 + 4 = 15.
2. Find the missing number in the sequence: 11, 20, ____, 38, 47.
29The sequence increases by 9 each step: 20 + 9 = 29.
3. Find the missing number in the sequence: 2, 6, ____, 14, 18.
10The sequence increases by 4 each step: 6 + 4 = 10.
4. Find the missing number in the sequence: 11, 14, ____, 20, 23.
17The sequence increases by 3 each step: 14 + 3 = 17.
5. Find the missing number in the sequence: 11, 17, ____, 29, 35.
23The sequence increases by 6 each step: 17 + 6 = 23.
6. Find the missing number in the sequence: 7, 15, ____, 31, 39.
23The sequence increases by 8 each step: 15 + 8 = 23.
7. Find the missing number in the sequence: 12, 20, ____, 36, 44.
28The sequence increases by 8 each step: 20 + 8 = 28.
8. Find the missing number in the sequence: 2, 10, ____, 26, 34.
18The sequence increases by 8 each step: 10 + 8 = 18.
9. Find the missing number in the sequence: 6, 13, ____, 27, 34.
20The sequence increases by 7 each step: 13 + 7 = 20.
10. Find the missing number in the sequence: 17, 25, ____, 41, 49.
33The sequence increases by 8 each step: 25 + 8 = 33.
11. Find the missing number in the sequence: 7, 13, ____, 25, 31.
19The sequence increases by 6 each step: 13 + 6 = 19.
12. Find the missing number in the sequence: 10, 13, ____, 19, 22.
16The sequence increases by 3 each step: 13 + 3 = 16.
12 questions · Seed 104733 · Age guidance, not curriculum certification