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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: 15, 23, ____, 39, 47.
4. Find the missing number in the sequence: 5, 12, ____, 26, 33.
5. Find the missing number in the sequence: 19, 28, ____, 46, 55.
6. Find the missing number in the sequence: 14, 17, ____, 23, 26.
7. Find the missing number in the sequence: 5, 11, ____, 23, 29.
8. Find the missing number in the sequence: 4, 13, ____, 31, 40.
9. Find the missing number in the sequence: 12, 21, ____, 39, 48.
10. Find the missing number in the sequence: 9, 15, ____, 27, 33.
11. Find the missing number in the sequence: 5, 9, ____, 17, 21.
12. Find the missing number in the sequence: 4, 14, ____, 34, 44.
12 questions · Seed 104736 · 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: 15, 23, ____, 39, 47.
31The sequence increases by 8 each step: 23 + 8 = 31.
4. Find the missing number in the sequence: 5, 12, ____, 26, 33.
19The sequence increases by 7 each step: 12 + 7 = 19.
5. Find the missing number in the sequence: 19, 28, ____, 46, 55.
37The sequence increases by 9 each step: 28 + 9 = 37.
6. Find the missing number in the sequence: 14, 17, ____, 23, 26.
20The sequence increases by 3 each step: 17 + 3 = 20.
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: 4, 13, ____, 31, 40.
22The sequence increases by 9 each step: 13 + 9 = 22.
9. Find the missing number in the sequence: 12, 21, ____, 39, 48.
30The sequence increases by 9 each step: 21 + 9 = 30.
10. Find the missing number in the sequence: 9, 15, ____, 27, 33.
21The sequence increases by 6 each step: 15 + 6 = 21.
11. Find the missing number in the sequence: 5, 9, ____, 17, 21.
13The sequence increases by 4 each step: 9 + 4 = 13.
12. Find the missing number in the sequence: 4, 14, ____, 34, 44.
24The sequence increases by 10 each step: 14 + 10 = 24.
12 questions · Seed 104736 · 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: 15, 23, ____, 39, 47.
4. Find the missing number in the sequence: 5, 12, ____, 26, 33.
5. Find the missing number in the sequence: 19, 28, ____, 46, 55.
6. Find the missing number in the sequence: 14, 17, ____, 23, 26.
7. Find the missing number in the sequence: 5, 11, ____, 23, 29.
8. Find the missing number in the sequence: 4, 13, ____, 31, 40.
9. Find the missing number in the sequence: 12, 21, ____, 39, 48.
10. Find the missing number in the sequence: 9, 15, ____, 27, 33.
11. Find the missing number in the sequence: 5, 9, ____, 17, 21.
12. Find the missing number in the sequence: 4, 14, ____, 34, 44.
12 questions · Seed 104736 · 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: 15, 23, ____, 39, 47.
31The sequence increases by 8 each step: 23 + 8 = 31.
4. Find the missing number in the sequence: 5, 12, ____, 26, 33.
19The sequence increases by 7 each step: 12 + 7 = 19.
5. Find the missing number in the sequence: 19, 28, ____, 46, 55.
37The sequence increases by 9 each step: 28 + 9 = 37.
6. Find the missing number in the sequence: 14, 17, ____, 23, 26.
20The sequence increases by 3 each step: 17 + 3 = 20.
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: 4, 13, ____, 31, 40.
22The sequence increases by 9 each step: 13 + 9 = 22.
9. Find the missing number in the sequence: 12, 21, ____, 39, 48.
30The sequence increases by 9 each step: 21 + 9 = 30.
10. Find the missing number in the sequence: 9, 15, ____, 27, 33.
21The sequence increases by 6 each step: 15 + 6 = 21.
11. Find the missing number in the sequence: 5, 9, ____, 17, 21.
13The sequence increases by 4 each step: 9 + 4 = 13.
12. Find the missing number in the sequence: 4, 14, ____, 34, 44.
24The sequence increases by 10 each step: 14 + 10 = 24.
12 questions · Seed 104736 · Age guidance, not curriculum certification