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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: 2, 10, ____, 26, 34.
2. Find the missing number in the sequence: 12, 18, ____, 30, 36.
3. Find the missing number in the sequence: 5, 12, ____, 26, 33.
4. Find the missing number in the sequence: 6, 12, ____, 24, 30.
5. Find the missing number in the sequence: 4, 7, ____, 13, 16.
6. Find the missing number in the sequence: 3, 12, ____, 30, 39.
7. Find the missing number in the sequence: 9, 16, ____, 30, 37.
8. Find the missing number in the sequence: 14, 17, ____, 23, 26.
9. Find the missing number in the sequence: 15, 25, ____, 45, 55.
10. Find the missing number in the sequence: 9, 18, ____, 36, 45.
11. Find the missing number in the sequence: 14, 24, ____, 44, 54.
12. Find the missing number in the sequence: 10, 13, ____, 19, 22.
12 questions · Seed 104750 · 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: 2, 10, ____, 26, 34.
18The sequence increases by 8 each step: 10 + 8 = 18.
2. Find the missing number in the sequence: 12, 18, ____, 30, 36.
24The sequence increases by 6 each step: 18 + 6 = 24.
3. Find the missing number in the sequence: 5, 12, ____, 26, 33.
19The sequence increases by 7 each step: 12 + 7 = 19.
4. Find the missing number in the sequence: 6, 12, ____, 24, 30.
18The sequence increases by 6 each step: 12 + 6 = 18.
5. Find the missing number in the sequence: 4, 7, ____, 13, 16.
10The sequence increases by 3 each step: 7 + 3 = 10.
6. Find the missing number in the sequence: 3, 12, ____, 30, 39.
21The sequence increases by 9 each step: 12 + 9 = 21.
7. Find the missing number in the sequence: 9, 16, ____, 30, 37.
23The sequence increases by 7 each step: 16 + 7 = 23.
8. Find the missing number in the sequence: 14, 17, ____, 23, 26.
20The sequence increases by 3 each step: 17 + 3 = 20.
9. Find the missing number in the sequence: 15, 25, ____, 45, 55.
35The sequence increases by 10 each step: 25 + 10 = 35.
10. Find the missing number in the sequence: 9, 18, ____, 36, 45.
27The sequence increases by 9 each step: 18 + 9 = 27.
11. Find the missing number in the sequence: 14, 24, ____, 44, 54.
34The sequence increases by 10 each step: 24 + 10 = 34.
12. Find the missing number in the sequence: 10, 13, ____, 19, 22.
16The sequence increases by 3 each step: 13 + 3 = 16.
12 questions · Seed 104750 · 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: 2, 10, ____, 26, 34.
2. Find the missing number in the sequence: 12, 18, ____, 30, 36.
3. Find the missing number in the sequence: 5, 12, ____, 26, 33.
4. Find the missing number in the sequence: 6, 12, ____, 24, 30.
5. Find the missing number in the sequence: 4, 7, ____, 13, 16.
6. Find the missing number in the sequence: 3, 12, ____, 30, 39.
7. Find the missing number in the sequence: 9, 16, ____, 30, 37.
8. Find the missing number in the sequence: 14, 17, ____, 23, 26.
9. Find the missing number in the sequence: 15, 25, ____, 45, 55.
10. Find the missing number in the sequence: 9, 18, ____, 36, 45.
11. Find the missing number in the sequence: 14, 24, ____, 44, 54.
12. Find the missing number in the sequence: 10, 13, ____, 19, 22.
12 questions · Seed 104750 · 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: 2, 10, ____, 26, 34.
18The sequence increases by 8 each step: 10 + 8 = 18.
2. Find the missing number in the sequence: 12, 18, ____, 30, 36.
24The sequence increases by 6 each step: 18 + 6 = 24.
3. Find the missing number in the sequence: 5, 12, ____, 26, 33.
19The sequence increases by 7 each step: 12 + 7 = 19.
4. Find the missing number in the sequence: 6, 12, ____, 24, 30.
18The sequence increases by 6 each step: 12 + 6 = 18.
5. Find the missing number in the sequence: 4, 7, ____, 13, 16.
10The sequence increases by 3 each step: 7 + 3 = 10.
6. Find the missing number in the sequence: 3, 12, ____, 30, 39.
21The sequence increases by 9 each step: 12 + 9 = 21.
7. Find the missing number in the sequence: 9, 16, ____, 30, 37.
23The sequence increases by 7 each step: 16 + 7 = 23.
8. Find the missing number in the sequence: 14, 17, ____, 23, 26.
20The sequence increases by 3 each step: 17 + 3 = 20.
9. Find the missing number in the sequence: 15, 25, ____, 45, 55.
35The sequence increases by 10 each step: 25 + 10 = 35.
10. Find the missing number in the sequence: 9, 18, ____, 36, 45.
27The sequence increases by 9 each step: 18 + 9 = 27.
11. Find the missing number in the sequence: 14, 24, ____, 44, 54.
34The sequence increases by 10 each step: 24 + 10 = 34.
12. Find the missing number in the sequence: 10, 13, ____, 19, 22.
16The sequence increases by 3 each step: 13 + 3 = 16.
12 questions · Seed 104750 · Age guidance, not curriculum certification