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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: 18, 28, ____, 48, 58.
2. Find the missing number in the sequence: 5, 12, ____, 26, 33.
3. Find the missing number in the sequence: 18, 27, ____, 45, 54.
4. Find the missing number in the sequence: 17, 23, ____, 35, 41.
5. Find the missing number in the sequence: 8, 17, ____, 35, 44.
6. Find the missing number in the sequence: 6, 10, ____, 18, 22.
7. Find the missing number in the sequence: 4, 8, ____, 16, 20.
8. Find the missing number in the sequence: 4, 14, ____, 34, 44.
9. Find the missing number in the sequence: 7, 14, ____, 28, 35.
10. Find the missing number in the sequence: 3, 12, ____, 30, 39.
11. Find the missing number in the sequence: 11, 18, ____, 32, 39.
12. Find the missing number in the sequence: 5, 11, ____, 23, 29.
12 questions · Seed 104751 · 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: 18, 28, ____, 48, 58.
38The sequence increases by 10 each step: 28 + 10 = 38.
2. Find the missing number in the sequence: 5, 12, ____, 26, 33.
19The sequence increases by 7 each step: 12 + 7 = 19.
3. Find the missing number in the sequence: 18, 27, ____, 45, 54.
36The sequence increases by 9 each step: 27 + 9 = 36.
4. Find the missing number in the sequence: 17, 23, ____, 35, 41.
29The sequence increases by 6 each step: 23 + 6 = 29.
5. Find the missing number in the sequence: 8, 17, ____, 35, 44.
26The sequence increases by 9 each step: 17 + 9 = 26.
6. Find the missing number in the sequence: 6, 10, ____, 18, 22.
14The sequence increases by 4 each step: 10 + 4 = 14.
7. Find the missing number in the sequence: 4, 8, ____, 16, 20.
12The sequence increases by 4 each step: 8 + 4 = 12.
8. Find the missing number in the sequence: 4, 14, ____, 34, 44.
24The sequence increases by 10 each step: 14 + 10 = 24.
9. Find the missing number in the sequence: 7, 14, ____, 28, 35.
21The sequence increases by 7 each step: 14 + 7 = 21.
10. Find the missing number in the sequence: 3, 12, ____, 30, 39.
21The sequence increases by 9 each step: 12 + 9 = 21.
11. Find the missing number in the sequence: 11, 18, ____, 32, 39.
25The sequence increases by 7 each step: 18 + 7 = 25.
12. Find the missing number in the sequence: 5, 11, ____, 23, 29.
17The sequence increases by 6 each step: 11 + 6 = 17.
12 questions · Seed 104751 · 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: 18, 28, ____, 48, 58.
2. Find the missing number in the sequence: 5, 12, ____, 26, 33.
3. Find the missing number in the sequence: 18, 27, ____, 45, 54.
4. Find the missing number in the sequence: 17, 23, ____, 35, 41.
5. Find the missing number in the sequence: 8, 17, ____, 35, 44.
6. Find the missing number in the sequence: 6, 10, ____, 18, 22.
7. Find the missing number in the sequence: 4, 8, ____, 16, 20.
8. Find the missing number in the sequence: 4, 14, ____, 34, 44.
9. Find the missing number in the sequence: 7, 14, ____, 28, 35.
10. Find the missing number in the sequence: 3, 12, ____, 30, 39.
11. Find the missing number in the sequence: 11, 18, ____, 32, 39.
12. Find the missing number in the sequence: 5, 11, ____, 23, 29.
12 questions · Seed 104751 · 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: 18, 28, ____, 48, 58.
38The sequence increases by 10 each step: 28 + 10 = 38.
2. Find the missing number in the sequence: 5, 12, ____, 26, 33.
19The sequence increases by 7 each step: 12 + 7 = 19.
3. Find the missing number in the sequence: 18, 27, ____, 45, 54.
36The sequence increases by 9 each step: 27 + 9 = 36.
4. Find the missing number in the sequence: 17, 23, ____, 35, 41.
29The sequence increases by 6 each step: 23 + 6 = 29.
5. Find the missing number in the sequence: 8, 17, ____, 35, 44.
26The sequence increases by 9 each step: 17 + 9 = 26.
6. Find the missing number in the sequence: 6, 10, ____, 18, 22.
14The sequence increases by 4 each step: 10 + 4 = 14.
7. Find the missing number in the sequence: 4, 8, ____, 16, 20.
12The sequence increases by 4 each step: 8 + 4 = 12.
8. Find the missing number in the sequence: 4, 14, ____, 34, 44.
24The sequence increases by 10 each step: 14 + 10 = 24.
9. Find the missing number in the sequence: 7, 14, ____, 28, 35.
21The sequence increases by 7 each step: 14 + 7 = 21.
10. Find the missing number in the sequence: 3, 12, ____, 30, 39.
21The sequence increases by 9 each step: 12 + 9 = 21.
11. Find the missing number in the sequence: 11, 18, ____, 32, 39.
25The sequence increases by 7 each step: 18 + 7 = 25.
12. Find the missing number in the sequence: 5, 11, ____, 23, 29.
17The sequence increases by 6 each step: 11 + 6 = 17.
12 questions · Seed 104751 · Age guidance, not curriculum certification