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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: 17, 25, ____, 41, 49.
2. Find the missing number in the sequence: 8, 16, ____, 32, 40.
3. Find the missing number in the sequence: 19, 22, ____, 28, 31.
4. Find the missing number in the sequence: 10, 13, ____, 19, 22.
5. Find the missing number in the sequence: 2, 10, ____, 26, 34.
6. Find the missing number in the sequence: 13, 21, ____, 37, 45.
7. Find the missing number in the sequence: 9, 15, ____, 27, 33.
8. Find the missing number in the sequence: 16, 25, ____, 43, 52.
9. Find the missing number in the sequence: 19, 27, ____, 43, 51.
10. Find the missing number in the sequence: 12, 19, ____, 33, 40.
11. Find the missing number in the sequence: 17, 20, ____, 26, 29.
12. Find the missing number in the sequence: 11, 14, ____, 20, 23.
12 questions · Seed 104755 · 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: 17, 25, ____, 41, 49.
33The sequence increases by 8 each step: 25 + 8 = 33.
2. Find the missing number in the sequence: 8, 16, ____, 32, 40.
24The sequence increases by 8 each step: 16 + 8 = 24.
3. Find the missing number in the sequence: 19, 22, ____, 28, 31.
25The sequence increases by 3 each step: 22 + 3 = 25.
4. Find the missing number in the sequence: 10, 13, ____, 19, 22.
16The sequence increases by 3 each step: 13 + 3 = 16.
5. Find the missing number in the sequence: 2, 10, ____, 26, 34.
18The sequence increases by 8 each step: 10 + 8 = 18.
6. Find the missing number in the sequence: 13, 21, ____, 37, 45.
29The sequence increases by 8 each step: 21 + 8 = 29.
7. Find the missing number in the sequence: 9, 15, ____, 27, 33.
21The sequence increases by 6 each step: 15 + 6 = 21.
8. Find the missing number in the sequence: 16, 25, ____, 43, 52.
34The sequence increases by 9 each step: 25 + 9 = 34.
9. Find the missing number in the sequence: 19, 27, ____, 43, 51.
35The sequence increases by 8 each step: 27 + 8 = 35.
10. Find the missing number in the sequence: 12, 19, ____, 33, 40.
26The sequence increases by 7 each step: 19 + 7 = 26.
11. Find the missing number in the sequence: 17, 20, ____, 26, 29.
23The sequence increases by 3 each step: 20 + 3 = 23.
12. Find the missing number in the sequence: 11, 14, ____, 20, 23.
17The sequence increases by 3 each step: 14 + 3 = 17.
12 questions · Seed 104755 · 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: 17, 25, ____, 41, 49.
2. Find the missing number in the sequence: 8, 16, ____, 32, 40.
3. Find the missing number in the sequence: 19, 22, ____, 28, 31.
4. Find the missing number in the sequence: 10, 13, ____, 19, 22.
5. Find the missing number in the sequence: 2, 10, ____, 26, 34.
6. Find the missing number in the sequence: 13, 21, ____, 37, 45.
7. Find the missing number in the sequence: 9, 15, ____, 27, 33.
8. Find the missing number in the sequence: 16, 25, ____, 43, 52.
9. Find the missing number in the sequence: 19, 27, ____, 43, 51.
10. Find the missing number in the sequence: 12, 19, ____, 33, 40.
11. Find the missing number in the sequence: 17, 20, ____, 26, 29.
12. Find the missing number in the sequence: 11, 14, ____, 20, 23.
12 questions · Seed 104755 · 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: 17, 25, ____, 41, 49.
33The sequence increases by 8 each step: 25 + 8 = 33.
2. Find the missing number in the sequence: 8, 16, ____, 32, 40.
24The sequence increases by 8 each step: 16 + 8 = 24.
3. Find the missing number in the sequence: 19, 22, ____, 28, 31.
25The sequence increases by 3 each step: 22 + 3 = 25.
4. Find the missing number in the sequence: 10, 13, ____, 19, 22.
16The sequence increases by 3 each step: 13 + 3 = 16.
5. Find the missing number in the sequence: 2, 10, ____, 26, 34.
18The sequence increases by 8 each step: 10 + 8 = 18.
6. Find the missing number in the sequence: 13, 21, ____, 37, 45.
29The sequence increases by 8 each step: 21 + 8 = 29.
7. Find the missing number in the sequence: 9, 15, ____, 27, 33.
21The sequence increases by 6 each step: 15 + 6 = 21.
8. Find the missing number in the sequence: 16, 25, ____, 43, 52.
34The sequence increases by 9 each step: 25 + 9 = 34.
9. Find the missing number in the sequence: 19, 27, ____, 43, 51.
35The sequence increases by 8 each step: 27 + 8 = 35.
10. Find the missing number in the sequence: 12, 19, ____, 33, 40.
26The sequence increases by 7 each step: 19 + 7 = 26.
11. Find the missing number in the sequence: 17, 20, ____, 26, 29.
23The sequence increases by 3 each step: 20 + 3 = 23.
12. Find the missing number in the sequence: 11, 14, ____, 20, 23.
17The sequence increases by 3 each step: 14 + 3 = 17.
12 questions · Seed 104755 · Age guidance, not curriculum certification