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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: 5, 11, ____, 23, 29.
2. Find the missing number in the sequence: 4, 11, ____, 25, 32.
3. Find the missing number in the sequence: 19, 22, ____, 28, 31.
4. Find the missing number in the sequence: 6, 10, ____, 18, 22.
5. Find the missing number in the sequence: 20, 26, ____, 38, 44.
6. Find the missing number in the sequence: 17, 25, ____, 41, 49.
7. Find the missing number in the sequence: 3, 7, ____, 15, 19.
8. Find the missing number in the sequence: 18, 24, ____, 36, 42.
9. Find the missing number in the sequence: 20, 23, ____, 29, 32.
10. Find the missing number in the sequence: 6, 14, ____, 30, 38.
11. Find the missing number in the sequence: 7, 14, ____, 28, 35.
12. Find the missing number in the sequence: 20, 28, ____, 44, 52.
12 questions · Seed 82 · 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: 5, 11, ____, 23, 29.
17The sequence increases by 6 each step: 11 + 6 = 17.
2. Find the missing number in the sequence: 4, 11, ____, 25, 32.
18The sequence increases by 7 each step: 11 + 7 = 18.
3. Find the missing number in the sequence: 19, 22, ____, 28, 31.
25The sequence increases by 3 each step: 22 + 3 = 25.
4. Find the missing number in the sequence: 6, 10, ____, 18, 22.
14The sequence increases by 4 each step: 10 + 4 = 14.
5. Find the missing number in the sequence: 20, 26, ____, 38, 44.
32The sequence increases by 6 each step: 26 + 6 = 32.
6. Find the missing number in the sequence: 17, 25, ____, 41, 49.
33The sequence increases by 8 each step: 25 + 8 = 33.
7. Find the missing number in the sequence: 3, 7, ____, 15, 19.
11The sequence increases by 4 each step: 7 + 4 = 11.
8. Find the missing number in the sequence: 18, 24, ____, 36, 42.
30The sequence increases by 6 each step: 24 + 6 = 30.
9. Find the missing number in the sequence: 20, 23, ____, 29, 32.
26The sequence increases by 3 each step: 23 + 3 = 26.
10. Find the missing number in the sequence: 6, 14, ____, 30, 38.
22The sequence increases by 8 each step: 14 + 8 = 22.
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: 20, 28, ____, 44, 52.
36The sequence increases by 8 each step: 28 + 8 = 36.
12 questions · Seed 82 · 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: 5, 11, ____, 23, 29.
2. Find the missing number in the sequence: 4, 11, ____, 25, 32.
3. Find the missing number in the sequence: 19, 22, ____, 28, 31.
4. Find the missing number in the sequence: 6, 10, ____, 18, 22.
5. Find the missing number in the sequence: 20, 26, ____, 38, 44.
6. Find the missing number in the sequence: 17, 25, ____, 41, 49.
7. Find the missing number in the sequence: 3, 7, ____, 15, 19.
8. Find the missing number in the sequence: 18, 24, ____, 36, 42.
9. Find the missing number in the sequence: 20, 23, ____, 29, 32.
10. Find the missing number in the sequence: 6, 14, ____, 30, 38.
11. Find the missing number in the sequence: 7, 14, ____, 28, 35.
12. Find the missing number in the sequence: 20, 28, ____, 44, 52.
12 questions · Seed 82 · 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: 5, 11, ____, 23, 29.
17The sequence increases by 6 each step: 11 + 6 = 17.
2. Find the missing number in the sequence: 4, 11, ____, 25, 32.
18The sequence increases by 7 each step: 11 + 7 = 18.
3. Find the missing number in the sequence: 19, 22, ____, 28, 31.
25The sequence increases by 3 each step: 22 + 3 = 25.
4. Find the missing number in the sequence: 6, 10, ____, 18, 22.
14The sequence increases by 4 each step: 10 + 4 = 14.
5. Find the missing number in the sequence: 20, 26, ____, 38, 44.
32The sequence increases by 6 each step: 26 + 6 = 32.
6. Find the missing number in the sequence: 17, 25, ____, 41, 49.
33The sequence increases by 8 each step: 25 + 8 = 33.
7. Find the missing number in the sequence: 3, 7, ____, 15, 19.
11The sequence increases by 4 each step: 7 + 4 = 11.
8. Find the missing number in the sequence: 18, 24, ____, 36, 42.
30The sequence increases by 6 each step: 24 + 6 = 30.
9. Find the missing number in the sequence: 20, 23, ____, 29, 32.
26The sequence increases by 3 each step: 23 + 3 = 26.
10. Find the missing number in the sequence: 6, 14, ____, 30, 38.
22The sequence increases by 8 each step: 14 + 8 = 22.
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: 20, 28, ____, 44, 52.
36The sequence increases by 8 each step: 28 + 8 = 36.
12 questions · Seed 82 · Age guidance, not curriculum certification