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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: 10, 13, ____, 19, 22.
2. Find the missing number in the sequence: 18, 28, ____, 48, 58.
3. Find the missing number in the sequence: 20, 27, ____, 41, 48.
4. Find the missing number in the sequence: 4, 13, ____, 31, 40.
5. Find the missing number in the sequence: 5, 8, ____, 14, 17.
6. Find the missing number in the sequence: 11, 19, ____, 35, 43.
7. Find the missing number in the sequence: 15, 18, ____, 24, 27.
8. Find the missing number in the sequence: 1, 7, ____, 19, 25.
9. Find the missing number in the sequence: 20, 26, ____, 38, 44.
10. Find the missing number in the sequence: 9, 19, ____, 39, 49.
11. Find the missing number in the sequence: 6, 16, ____, 36, 46.
12. Find the missing number in the sequence: 3, 10, ____, 24, 31.
12 questions · Seed 60 · 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: 10, 13, ____, 19, 22.
16The sequence increases by 3 each step: 13 + 3 = 16.
2. Find the missing number in the sequence: 18, 28, ____, 48, 58.
38The sequence increases by 10 each step: 28 + 10 = 38.
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: 4, 13, ____, 31, 40.
22The sequence increases by 9 each step: 13 + 9 = 22.
5. Find the missing number in the sequence: 5, 8, ____, 14, 17.
11The sequence increases by 3 each step: 8 + 3 = 11.
6. Find the missing number in the sequence: 11, 19, ____, 35, 43.
27The sequence increases by 8 each step: 19 + 8 = 27.
7. Find the missing number in the sequence: 15, 18, ____, 24, 27.
21The sequence increases by 3 each step: 18 + 3 = 21.
8. Find the missing number in the sequence: 1, 7, ____, 19, 25.
13The sequence increases by 6 each step: 7 + 6 = 13.
9. Find the missing number in the sequence: 20, 26, ____, 38, 44.
32The sequence increases by 6 each step: 26 + 6 = 32.
10. Find the missing number in the sequence: 9, 19, ____, 39, 49.
29The sequence increases by 10 each step: 19 + 10 = 29.
11. Find the missing number in the sequence: 6, 16, ____, 36, 46.
26The sequence increases by 10 each step: 16 + 10 = 26.
12. Find the missing number in the sequence: 3, 10, ____, 24, 31.
17The sequence increases by 7 each step: 10 + 7 = 17.
12 questions · Seed 60 · 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: 10, 13, ____, 19, 22.
2. Find the missing number in the sequence: 18, 28, ____, 48, 58.
3. Find the missing number in the sequence: 20, 27, ____, 41, 48.
4. Find the missing number in the sequence: 4, 13, ____, 31, 40.
5. Find the missing number in the sequence: 5, 8, ____, 14, 17.
6. Find the missing number in the sequence: 11, 19, ____, 35, 43.
7. Find the missing number in the sequence: 15, 18, ____, 24, 27.
8. Find the missing number in the sequence: 1, 7, ____, 19, 25.
9. Find the missing number in the sequence: 20, 26, ____, 38, 44.
10. Find the missing number in the sequence: 9, 19, ____, 39, 49.
11. Find the missing number in the sequence: 6, 16, ____, 36, 46.
12. Find the missing number in the sequence: 3, 10, ____, 24, 31.
12 questions · Seed 60 · 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: 10, 13, ____, 19, 22.
16The sequence increases by 3 each step: 13 + 3 = 16.
2. Find the missing number in the sequence: 18, 28, ____, 48, 58.
38The sequence increases by 10 each step: 28 + 10 = 38.
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: 4, 13, ____, 31, 40.
22The sequence increases by 9 each step: 13 + 9 = 22.
5. Find the missing number in the sequence: 5, 8, ____, 14, 17.
11The sequence increases by 3 each step: 8 + 3 = 11.
6. Find the missing number in the sequence: 11, 19, ____, 35, 43.
27The sequence increases by 8 each step: 19 + 8 = 27.
7. Find the missing number in the sequence: 15, 18, ____, 24, 27.
21The sequence increases by 3 each step: 18 + 3 = 21.
8. Find the missing number in the sequence: 1, 7, ____, 19, 25.
13The sequence increases by 6 each step: 7 + 6 = 13.
9. Find the missing number in the sequence: 20, 26, ____, 38, 44.
32The sequence increases by 6 each step: 26 + 6 = 32.
10. Find the missing number in the sequence: 9, 19, ____, 39, 49.
29The sequence increases by 10 each step: 19 + 10 = 29.
11. Find the missing number in the sequence: 6, 16, ____, 36, 46.
26The sequence increases by 10 each step: 16 + 10 = 26.
12. Find the missing number in the sequence: 3, 10, ____, 24, 31.
17The sequence increases by 7 each step: 10 + 7 = 17.
12 questions · Seed 60 · Age guidance, not curriculum certification