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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: 6, 10, ____, 18, 22.
2. Find the missing number in the sequence: 5, 12, ____, 26, 33.
3. Find the missing number in the sequence: 1, 8, ____, 22, 29.
4. Find the missing number in the sequence: 1, 11, ____, 31, 41.
5. Find the missing number in the sequence: 3, 9, ____, 21, 27.
6. Find the missing number in the sequence: 2, 9, ____, 23, 30.
7. Find the missing number in the sequence: 12, 15, ____, 21, 24.
8. Find the missing number in the sequence: 8, 14, ____, 26, 32.
9. Find the missing number in the sequence: 13, 19, ____, 31, 37.
10. Find the missing number in the sequence: 4, 7, ____, 13, 16.
11. Find the missing number in the sequence: 17, 23, ____, 35, 41.
12. Find the missing number in the sequence: 5, 8, ____, 14, 17.
12 questions · Seed 48 · 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: 6, 10, ____, 18, 22.
14The sequence increases by 4 each step: 10 + 4 = 14.
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: 1, 8, ____, 22, 29.
15The sequence increases by 7 each step: 8 + 7 = 15.
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: 3, 9, ____, 21, 27.
15The sequence increases by 6 each step: 9 + 6 = 15.
6. Find the missing number in the sequence: 2, 9, ____, 23, 30.
16The sequence increases by 7 each step: 9 + 7 = 16.
7. Find the missing number in the sequence: 12, 15, ____, 21, 24.
18The sequence increases by 3 each step: 15 + 3 = 18.
8. Find the missing number in the sequence: 8, 14, ____, 26, 32.
20The sequence increases by 6 each step: 14 + 6 = 20.
9. Find the missing number in the sequence: 13, 19, ____, 31, 37.
25The sequence increases by 6 each step: 19 + 6 = 25.
10. Find the missing number in the sequence: 4, 7, ____, 13, 16.
10The sequence increases by 3 each step: 7 + 3 = 10.
11. Find the missing number in the sequence: 17, 23, ____, 35, 41.
29The sequence increases by 6 each step: 23 + 6 = 29.
12. Find the missing number in the sequence: 5, 8, ____, 14, 17.
11The sequence increases by 3 each step: 8 + 3 = 11.
12 questions · Seed 48 · 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: 6, 10, ____, 18, 22.
2. Find the missing number in the sequence: 5, 12, ____, 26, 33.
3. Find the missing number in the sequence: 1, 8, ____, 22, 29.
4. Find the missing number in the sequence: 1, 11, ____, 31, 41.
5. Find the missing number in the sequence: 3, 9, ____, 21, 27.
6. Find the missing number in the sequence: 2, 9, ____, 23, 30.
7. Find the missing number in the sequence: 12, 15, ____, 21, 24.
8. Find the missing number in the sequence: 8, 14, ____, 26, 32.
9. Find the missing number in the sequence: 13, 19, ____, 31, 37.
10. Find the missing number in the sequence: 4, 7, ____, 13, 16.
11. Find the missing number in the sequence: 17, 23, ____, 35, 41.
12. Find the missing number in the sequence: 5, 8, ____, 14, 17.
12 questions · Seed 48 · 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: 6, 10, ____, 18, 22.
14The sequence increases by 4 each step: 10 + 4 = 14.
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: 1, 8, ____, 22, 29.
15The sequence increases by 7 each step: 8 + 7 = 15.
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: 3, 9, ____, 21, 27.
15The sequence increases by 6 each step: 9 + 6 = 15.
6. Find the missing number in the sequence: 2, 9, ____, 23, 30.
16The sequence increases by 7 each step: 9 + 7 = 16.
7. Find the missing number in the sequence: 12, 15, ____, 21, 24.
18The sequence increases by 3 each step: 15 + 3 = 18.
8. Find the missing number in the sequence: 8, 14, ____, 26, 32.
20The sequence increases by 6 each step: 14 + 6 = 20.
9. Find the missing number in the sequence: 13, 19, ____, 31, 37.
25The sequence increases by 6 each step: 19 + 6 = 25.
10. Find the missing number in the sequence: 4, 7, ____, 13, 16.
10The sequence increases by 3 each step: 7 + 3 = 10.
11. Find the missing number in the sequence: 17, 23, ____, 35, 41.
29The sequence increases by 6 each step: 23 + 6 = 29.
12. Find the missing number in the sequence: 5, 8, ____, 14, 17.
11The sequence increases by 3 each step: 8 + 3 = 11.
12 questions · Seed 48 · Age guidance, not curriculum certification