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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: 2, 5, ____, 11, 14.
2. Find the missing number in the sequence: 2, 8, ____, 20, 26.
3. Find the missing number in the sequence: 10, 20, ____, 40, 50.
4. Find the missing number in the sequence: 15, 25, ____, 45, 55.
5. Find the missing number in the sequence: 4, 13, ____, 31, 40.
6. Find the missing number in the sequence: 17, 27, ____, 47, 57.
7. Find the missing number in the sequence: 5, 11, ____, 23, 29.
8. Find the missing number in the sequence: 18, 27, ____, 45, 54.
9. Find the missing number in the sequence: 4, 10, ____, 22, 28.
10. Find the missing number in the sequence: 13, 20, ____, 34, 41.
11. Find the missing number in the sequence: 10, 13, ____, 19, 22.
12. Find the missing number in the sequence: 17, 23, ____, 35, 41.
12 questions · Seed 104729 · 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: 2, 5, ____, 11, 14.
8The sequence increases by 3 each step: 5 + 3 = 8.
2. Find the missing number in the sequence: 2, 8, ____, 20, 26.
14The sequence increases by 6 each step: 8 + 6 = 14.
3. Find the missing number in the sequence: 10, 20, ____, 40, 50.
30The sequence increases by 10 each step: 20 + 10 = 30.
4. Find the missing number in the sequence: 15, 25, ____, 45, 55.
35The sequence increases by 10 each step: 25 + 10 = 35.
5. Find the missing number in the sequence: 4, 13, ____, 31, 40.
22The sequence increases by 9 each step: 13 + 9 = 22.
6. Find the missing number in the sequence: 17, 27, ____, 47, 57.
37The sequence increases by 10 each step: 27 + 10 = 37.
7. Find the missing number in the sequence: 5, 11, ____, 23, 29.
17The sequence increases by 6 each step: 11 + 6 = 17.
8. Find the missing number in the sequence: 18, 27, ____, 45, 54.
36The sequence increases by 9 each step: 27 + 9 = 36.
9. Find the missing number in the sequence: 4, 10, ____, 22, 28.
16The sequence increases by 6 each step: 10 + 6 = 16.
10. Find the missing number in the sequence: 13, 20, ____, 34, 41.
27The sequence increases by 7 each step: 20 + 7 = 27.
11. Find the missing number in the sequence: 10, 13, ____, 19, 22.
16The sequence increases by 3 each step: 13 + 3 = 16.
12. Find the missing number in the sequence: 17, 23, ____, 35, 41.
29The sequence increases by 6 each step: 23 + 6 = 29.
12 questions · Seed 104729 · 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: 2, 5, ____, 11, 14.
2. Find the missing number in the sequence: 2, 8, ____, 20, 26.
3. Find the missing number in the sequence: 10, 20, ____, 40, 50.
4. Find the missing number in the sequence: 15, 25, ____, 45, 55.
5. Find the missing number in the sequence: 4, 13, ____, 31, 40.
6. Find the missing number in the sequence: 17, 27, ____, 47, 57.
7. Find the missing number in the sequence: 5, 11, ____, 23, 29.
8. Find the missing number in the sequence: 18, 27, ____, 45, 54.
9. Find the missing number in the sequence: 4, 10, ____, 22, 28.
10. Find the missing number in the sequence: 13, 20, ____, 34, 41.
11. Find the missing number in the sequence: 10, 13, ____, 19, 22.
12. Find the missing number in the sequence: 17, 23, ____, 35, 41.
12 questions · Seed 104729 · 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: 2, 5, ____, 11, 14.
8The sequence increases by 3 each step: 5 + 3 = 8.
2. Find the missing number in the sequence: 2, 8, ____, 20, 26.
14The sequence increases by 6 each step: 8 + 6 = 14.
3. Find the missing number in the sequence: 10, 20, ____, 40, 50.
30The sequence increases by 10 each step: 20 + 10 = 30.
4. Find the missing number in the sequence: 15, 25, ____, 45, 55.
35The sequence increases by 10 each step: 25 + 10 = 35.
5. Find the missing number in the sequence: 4, 13, ____, 31, 40.
22The sequence increases by 9 each step: 13 + 9 = 22.
6. Find the missing number in the sequence: 17, 27, ____, 47, 57.
37The sequence increases by 10 each step: 27 + 10 = 37.
7. Find the missing number in the sequence: 5, 11, ____, 23, 29.
17The sequence increases by 6 each step: 11 + 6 = 17.
8. Find the missing number in the sequence: 18, 27, ____, 45, 54.
36The sequence increases by 9 each step: 27 + 9 = 36.
9. Find the missing number in the sequence: 4, 10, ____, 22, 28.
16The sequence increases by 6 each step: 10 + 6 = 16.
10. Find the missing number in the sequence: 13, 20, ____, 34, 41.
27The sequence increases by 7 each step: 20 + 7 = 27.
11. Find the missing number in the sequence: 10, 13, ____, 19, 22.
16The sequence increases by 3 each step: 13 + 3 = 16.
12. Find the missing number in the sequence: 17, 23, ____, 35, 41.
29The sequence increases by 6 each step: 23 + 6 = 29.
12 questions · Seed 104729 · Age guidance, not curriculum certification