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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 4-6
Missing sequence terms
Take your time. Show your thinking.
1. Find the missing number in the sequence: 12, 14, ____, 18, 20.
2. Find the missing number in the sequence: 7, 8, ____, 10, 11.
3. Find the missing number in the sequence: 4, 9, ____, 19, 24.
4. Find the missing number in the sequence: 14, 16, ____, 20, 22.
5. Find the missing number in the sequence: 11, 16, ____, 26, 31.
6. Find the missing number in the sequence: 15, 16, ____, 18, 19.
7. Find the missing number in the sequence: 10, 12, ____, 16, 18.
8. Find the missing number in the sequence: 11, 12, ____, 14, 15.
9. Find the missing number in the sequence: 6, 11, ____, 21, 26.
10. Find the missing number in the sequence: 20, 25, ____, 35, 40.
11. Find the missing number in the sequence: 8, 9, ____, 11, 12.
12. Find the missing number in the sequence: 4, 6, ____, 10, 12.
12 questions · Seed 104752 · Age guidance, not curriculum certification
View the answer key
Worksheet StudioAnswer key · Ages 4-6
Missing sequence terms
Answers and reasoning. Review before teaching.
1. Find the missing number in the sequence: 12, 14, ____, 18, 20.
16The sequence increases by 2 each step: 14 + 2 = 16.
2. Find the missing number in the sequence: 7, 8, ____, 10, 11.
9The sequence increases by 1 each step: 8 + 1 = 9.
3. Find the missing number in the sequence: 4, 9, ____, 19, 24.
14The sequence increases by 5 each step: 9 + 5 = 14.
4. Find the missing number in the sequence: 14, 16, ____, 20, 22.
18The sequence increases by 2 each step: 16 + 2 = 18.
5. Find the missing number in the sequence: 11, 16, ____, 26, 31.
21The sequence increases by 5 each step: 16 + 5 = 21.
6. Find the missing number in the sequence: 15, 16, ____, 18, 19.
17The sequence increases by 1 each step: 16 + 1 = 17.
7. Find the missing number in the sequence: 10, 12, ____, 16, 18.
14The sequence increases by 2 each step: 12 + 2 = 14.
8. Find the missing number in the sequence: 11, 12, ____, 14, 15.
13The sequence increases by 1 each step: 12 + 1 = 13.
9. Find the missing number in the sequence: 6, 11, ____, 21, 26.
16The sequence increases by 5 each step: 11 + 5 = 16.
10. Find the missing number in the sequence: 20, 25, ____, 35, 40.
30The sequence increases by 5 each step: 25 + 5 = 30.
11. Find the missing number in the sequence: 8, 9, ____, 11, 12.
10The sequence increases by 1 each step: 9 + 1 = 10.
12. Find the missing number in the sequence: 4, 6, ____, 10, 12.
8The sequence increases by 2 each step: 6 + 2 = 8.
12 questions · Seed 104752 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 4-6
Missing sequence terms
Take your time. Show your thinking.
1. Find the missing number in the sequence: 12, 14, ____, 18, 20.
2. Find the missing number in the sequence: 7, 8, ____, 10, 11.
3. Find the missing number in the sequence: 4, 9, ____, 19, 24.
4. Find the missing number in the sequence: 14, 16, ____, 20, 22.
5. Find the missing number in the sequence: 11, 16, ____, 26, 31.
6. Find the missing number in the sequence: 15, 16, ____, 18, 19.
7. Find the missing number in the sequence: 10, 12, ____, 16, 18.
8. Find the missing number in the sequence: 11, 12, ____, 14, 15.
9. Find the missing number in the sequence: 6, 11, ____, 21, 26.
10. Find the missing number in the sequence: 20, 25, ____, 35, 40.
11. Find the missing number in the sequence: 8, 9, ____, 11, 12.
12. Find the missing number in the sequence: 4, 6, ____, 10, 12.
12 questions · Seed 104752 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 4-6
Missing sequence terms
Answers and reasoning. Review before teaching.
1. Find the missing number in the sequence: 12, 14, ____, 18, 20.
16The sequence increases by 2 each step: 14 + 2 = 16.
2. Find the missing number in the sequence: 7, 8, ____, 10, 11.
9The sequence increases by 1 each step: 8 + 1 = 9.
3. Find the missing number in the sequence: 4, 9, ____, 19, 24.
14The sequence increases by 5 each step: 9 + 5 = 14.
4. Find the missing number in the sequence: 14, 16, ____, 20, 22.
18The sequence increases by 2 each step: 16 + 2 = 18.
5. Find the missing number in the sequence: 11, 16, ____, 26, 31.
21The sequence increases by 5 each step: 16 + 5 = 21.
6. Find the missing number in the sequence: 15, 16, ____, 18, 19.
17The sequence increases by 1 each step: 16 + 1 = 17.
7. Find the missing number in the sequence: 10, 12, ____, 16, 18.
14The sequence increases by 2 each step: 12 + 2 = 14.
8. Find the missing number in the sequence: 11, 12, ____, 14, 15.
13The sequence increases by 1 each step: 12 + 1 = 13.
9. Find the missing number in the sequence: 6, 11, ____, 21, 26.
16The sequence increases by 5 each step: 11 + 5 = 16.
10. Find the missing number in the sequence: 20, 25, ____, 35, 40.
30The sequence increases by 5 each step: 25 + 5 = 30.
11. Find the missing number in the sequence: 8, 9, ____, 11, 12.
10The sequence increases by 1 each step: 9 + 1 = 10.
12. Find the missing number in the sequence: 4, 6, ____, 10, 12.
8The sequence increases by 2 each step: 6 + 2 = 8.
12 questions · Seed 104752 · Age guidance, not curriculum certification