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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: 11, 19, ____, 35, 43.
2. Find the missing number in the sequence: 11, 14, ____, 20, 23.
3. Find the missing number in the sequence: 20, 27, ____, 41, 48.
4. Find the missing number in the sequence: 1, 11, ____, 31, 41.
5. Find the missing number in the sequence: 12, 22, ____, 42, 52.
6. Find the missing number in the sequence: 16, 24, ____, 40, 48.
7. Find the missing number in the sequence: 19, 28, ____, 46, 55.
8. Find the missing number in the sequence: 6, 16, ____, 36, 46.
9. Find the missing number in the sequence: 3, 12, ____, 30, 39.
10. Find the missing number in the sequence: 18, 21, ____, 27, 30.
11. Find the missing number in the sequence: 11, 20, ____, 38, 47.
12. Find the missing number in the sequence: 6, 15, ____, 33, 42.
12 questions · Seed 104741 · 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: 11, 19, ____, 35, 43.
27The sequence increases by 8 each step: 19 + 8 = 27.
2. Find the missing number in the sequence: 11, 14, ____, 20, 23.
17The sequence increases by 3 each step: 14 + 3 = 17.
3. Find the missing number in the sequence: 20, 27, ____, 41, 48.
34The sequence increases by 7 each step: 27 + 7 = 34.
4. Find the missing number in the sequence: 1, 11, ____, 31, 41.
21The sequence increases by 10 each step: 11 + 10 = 21.
5. Find the missing number in the sequence: 12, 22, ____, 42, 52.
32The sequence increases by 10 each step: 22 + 10 = 32.
6. Find the missing number in the sequence: 16, 24, ____, 40, 48.
32The sequence increases by 8 each step: 24 + 8 = 32.
7. Find the missing number in the sequence: 19, 28, ____, 46, 55.
37The sequence increases by 9 each step: 28 + 9 = 37.
8. Find the missing number in the sequence: 6, 16, ____, 36, 46.
26The sequence increases by 10 each step: 16 + 10 = 26.
9. Find the missing number in the sequence: 3, 12, ____, 30, 39.
21The sequence increases by 9 each step: 12 + 9 = 21.
10. Find the missing number in the sequence: 18, 21, ____, 27, 30.
24The sequence increases by 3 each step: 21 + 3 = 24.
11. Find the missing number in the sequence: 11, 20, ____, 38, 47.
29The sequence increases by 9 each step: 20 + 9 = 29.
12. Find the missing number in the sequence: 6, 15, ____, 33, 42.
24The sequence increases by 9 each step: 15 + 9 = 24.
12 questions · Seed 104741 · 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: 11, 19, ____, 35, 43.
2. Find the missing number in the sequence: 11, 14, ____, 20, 23.
3. Find the missing number in the sequence: 20, 27, ____, 41, 48.
4. Find the missing number in the sequence: 1, 11, ____, 31, 41.
5. Find the missing number in the sequence: 12, 22, ____, 42, 52.
6. Find the missing number in the sequence: 16, 24, ____, 40, 48.
7. Find the missing number in the sequence: 19, 28, ____, 46, 55.
8. Find the missing number in the sequence: 6, 16, ____, 36, 46.
9. Find the missing number in the sequence: 3, 12, ____, 30, 39.
10. Find the missing number in the sequence: 18, 21, ____, 27, 30.
11. Find the missing number in the sequence: 11, 20, ____, 38, 47.
12. Find the missing number in the sequence: 6, 15, ____, 33, 42.
12 questions · Seed 104741 · 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: 11, 19, ____, 35, 43.
27The sequence increases by 8 each step: 19 + 8 = 27.
2. Find the missing number in the sequence: 11, 14, ____, 20, 23.
17The sequence increases by 3 each step: 14 + 3 = 17.
3. Find the missing number in the sequence: 20, 27, ____, 41, 48.
34The sequence increases by 7 each step: 27 + 7 = 34.
4. Find the missing number in the sequence: 1, 11, ____, 31, 41.
21The sequence increases by 10 each step: 11 + 10 = 21.
5. Find the missing number in the sequence: 12, 22, ____, 42, 52.
32The sequence increases by 10 each step: 22 + 10 = 32.
6. Find the missing number in the sequence: 16, 24, ____, 40, 48.
32The sequence increases by 8 each step: 24 + 8 = 32.
7. Find the missing number in the sequence: 19, 28, ____, 46, 55.
37The sequence increases by 9 each step: 28 + 9 = 37.
8. Find the missing number in the sequence: 6, 16, ____, 36, 46.
26The sequence increases by 10 each step: 16 + 10 = 26.
9. Find the missing number in the sequence: 3, 12, ____, 30, 39.
21The sequence increases by 9 each step: 12 + 9 = 21.
10. Find the missing number in the sequence: 18, 21, ____, 27, 30.
24The sequence increases by 3 each step: 21 + 3 = 24.
11. Find the missing number in the sequence: 11, 20, ____, 38, 47.
29The sequence increases by 9 each step: 20 + 9 = 29.
12. Find the missing number in the sequence: 6, 15, ____, 33, 42.
24The sequence increases by 9 each step: 15 + 9 = 24.
12 questions · Seed 104741 · Age guidance, not curriculum certification