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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: 3, 13, ____, 33, 43.
2. Find the missing number in the sequence: 10, 13, ____, 19, 22.
3. Find the missing number in the sequence: 5, 9, ____, 17, 21.
4. Find the missing number in the sequence: 13, 21, ____, 37, 45.
5. Find the missing number in the sequence: 16, 20, ____, 28, 32.
6. Find the missing number in the sequence: 5, 11, ____, 23, 29.
7. Find the missing number in the sequence: 1, 5, ____, 13, 17.
8. Find the missing number in the sequence: 15, 23, ____, 39, 47.
9. Find the missing number in the sequence: 13, 16, ____, 22, 25.
10. Find the missing number in the sequence: 13, 23, ____, 43, 53.
11. Find the missing number in the sequence: 18, 24, ____, 36, 42.
12. Find the missing number in the sequence: 8, 16, ____, 32, 40.
12 questions · Seed 104746 · 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: 3, 13, ____, 33, 43.
23The sequence increases by 10 each step: 13 + 10 = 23.
2. Find the missing number in the sequence: 10, 13, ____, 19, 22.
16The sequence increases by 3 each step: 13 + 3 = 16.
3. Find the missing number in the sequence: 5, 9, ____, 17, 21.
13The sequence increases by 4 each step: 9 + 4 = 13.
4. Find the missing number in the sequence: 13, 21, ____, 37, 45.
29The sequence increases by 8 each step: 21 + 8 = 29.
5. Find the missing number in the sequence: 16, 20, ____, 28, 32.
24The sequence increases by 4 each step: 20 + 4 = 24.
6. Find the missing number in the sequence: 5, 11, ____, 23, 29.
17The sequence increases by 6 each step: 11 + 6 = 17.
7. Find the missing number in the sequence: 1, 5, ____, 13, 17.
9The sequence increases by 4 each step: 5 + 4 = 9.
8. Find the missing number in the sequence: 15, 23, ____, 39, 47.
31The sequence increases by 8 each step: 23 + 8 = 31.
9. Find the missing number in the sequence: 13, 16, ____, 22, 25.
19The sequence increases by 3 each step: 16 + 3 = 19.
10. Find the missing number in the sequence: 13, 23, ____, 43, 53.
33The sequence increases by 10 each step: 23 + 10 = 33.
11. Find the missing number in the sequence: 18, 24, ____, 36, 42.
30The sequence increases by 6 each step: 24 + 6 = 30.
12. Find the missing number in the sequence: 8, 16, ____, 32, 40.
24The sequence increases by 8 each step: 16 + 8 = 24.
12 questions · Seed 104746 · 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: 3, 13, ____, 33, 43.
2. Find the missing number in the sequence: 10, 13, ____, 19, 22.
3. Find the missing number in the sequence: 5, 9, ____, 17, 21.
4. Find the missing number in the sequence: 13, 21, ____, 37, 45.
5. Find the missing number in the sequence: 16, 20, ____, 28, 32.
6. Find the missing number in the sequence: 5, 11, ____, 23, 29.
7. Find the missing number in the sequence: 1, 5, ____, 13, 17.
8. Find the missing number in the sequence: 15, 23, ____, 39, 47.
9. Find the missing number in the sequence: 13, 16, ____, 22, 25.
10. Find the missing number in the sequence: 13, 23, ____, 43, 53.
11. Find the missing number in the sequence: 18, 24, ____, 36, 42.
12. Find the missing number in the sequence: 8, 16, ____, 32, 40.
12 questions · Seed 104746 · 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: 3, 13, ____, 33, 43.
23The sequence increases by 10 each step: 13 + 10 = 23.
2. Find the missing number in the sequence: 10, 13, ____, 19, 22.
16The sequence increases by 3 each step: 13 + 3 = 16.
3. Find the missing number in the sequence: 5, 9, ____, 17, 21.
13The sequence increases by 4 each step: 9 + 4 = 13.
4. Find the missing number in the sequence: 13, 21, ____, 37, 45.
29The sequence increases by 8 each step: 21 + 8 = 29.
5. Find the missing number in the sequence: 16, 20, ____, 28, 32.
24The sequence increases by 4 each step: 20 + 4 = 24.
6. Find the missing number in the sequence: 5, 11, ____, 23, 29.
17The sequence increases by 6 each step: 11 + 6 = 17.
7. Find the missing number in the sequence: 1, 5, ____, 13, 17.
9The sequence increases by 4 each step: 5 + 4 = 9.
8. Find the missing number in the sequence: 15, 23, ____, 39, 47.
31The sequence increases by 8 each step: 23 + 8 = 31.
9. Find the missing number in the sequence: 13, 16, ____, 22, 25.
19The sequence increases by 3 each step: 16 + 3 = 19.
10. Find the missing number in the sequence: 13, 23, ____, 43, 53.
33The sequence increases by 10 each step: 23 + 10 = 33.
11. Find the missing number in the sequence: 18, 24, ____, 36, 42.
30The sequence increases by 6 each step: 24 + 6 = 30.
12. Find the missing number in the sequence: 8, 16, ____, 32, 40.
24The sequence increases by 8 each step: 16 + 8 = 24.
12 questions · Seed 104746 · Age guidance, not curriculum certification