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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: 1, 3, ____, 7, 9.
2. Find the missing number in the sequence: 4, 9, ____, 19, 24.
3. Find the missing number in the sequence: 10, 12, ____, 16, 18.
4. Find the missing number in the sequence: 13, 18, ____, 28, 33.
5. Find the missing number in the sequence: 15, 20, ____, 30, 35.
6. Find the missing number in the sequence: 8, 10, ____, 14, 16.
7. Find the missing number in the sequence: 6, 8, ____, 12, 14.
8. Find the missing number in the sequence: 6, 11, ____, 21, 26.
9. Find the missing number in the sequence: 8, 13, ____, 23, 28.
10. Find the missing number in the sequence: 15, 16, ____, 18, 19.
11. Find the missing number in the sequence: 12, 14, ____, 18, 20.
12. Find the missing number in the sequence: 6, 7, ____, 9, 10.
12 questions · Seed 45 · 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: 1, 3, ____, 7, 9.
5The sequence increases by 2 each step: 3 + 2 = 5.
2. Find the missing number in the sequence: 4, 9, ____, 19, 24.
14The sequence increases by 5 each step: 9 + 5 = 14.
3. Find the missing number in the sequence: 10, 12, ____, 16, 18.
14The sequence increases by 2 each step: 12 + 2 = 14.
4. Find the missing number in the sequence: 13, 18, ____, 28, 33.
23The sequence increases by 5 each step: 18 + 5 = 23.
5. Find the missing number in the sequence: 15, 20, ____, 30, 35.
25The sequence increases by 5 each step: 20 + 5 = 25.
6. Find the missing number in the sequence: 8, 10, ____, 14, 16.
12The sequence increases by 2 each step: 10 + 2 = 12.
7. Find the missing number in the sequence: 6, 8, ____, 12, 14.
10The sequence increases by 2 each step: 8 + 2 = 10.
8. Find the missing number in the sequence: 6, 11, ____, 21, 26.
16The sequence increases by 5 each step: 11 + 5 = 16.
9. Find the missing number in the sequence: 8, 13, ____, 23, 28.
18The sequence increases by 5 each step: 13 + 5 = 18.
10. Find the missing number in the sequence: 15, 16, ____, 18, 19.
17The sequence increases by 1 each step: 16 + 1 = 17.
11. Find the missing number in the sequence: 12, 14, ____, 18, 20.
16The sequence increases by 2 each step: 14 + 2 = 16.
12. Find the missing number in the sequence: 6, 7, ____, 9, 10.
8The sequence increases by 1 each step: 7 + 1 = 8.
12 questions · Seed 45 · 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: 1, 3, ____, 7, 9.
2. Find the missing number in the sequence: 4, 9, ____, 19, 24.
3. Find the missing number in the sequence: 10, 12, ____, 16, 18.
4. Find the missing number in the sequence: 13, 18, ____, 28, 33.
5. Find the missing number in the sequence: 15, 20, ____, 30, 35.
6. Find the missing number in the sequence: 8, 10, ____, 14, 16.
7. Find the missing number in the sequence: 6, 8, ____, 12, 14.
8. Find the missing number in the sequence: 6, 11, ____, 21, 26.
9. Find the missing number in the sequence: 8, 13, ____, 23, 28.
10. Find the missing number in the sequence: 15, 16, ____, 18, 19.
11. Find the missing number in the sequence: 12, 14, ____, 18, 20.
12. Find the missing number in the sequence: 6, 7, ____, 9, 10.
12 questions · Seed 45 · 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: 1, 3, ____, 7, 9.
5The sequence increases by 2 each step: 3 + 2 = 5.
2. Find the missing number in the sequence: 4, 9, ____, 19, 24.
14The sequence increases by 5 each step: 9 + 5 = 14.
3. Find the missing number in the sequence: 10, 12, ____, 16, 18.
14The sequence increases by 2 each step: 12 + 2 = 14.
4. Find the missing number in the sequence: 13, 18, ____, 28, 33.
23The sequence increases by 5 each step: 18 + 5 = 23.
5. Find the missing number in the sequence: 15, 20, ____, 30, 35.
25The sequence increases by 5 each step: 20 + 5 = 25.
6. Find the missing number in the sequence: 8, 10, ____, 14, 16.
12The sequence increases by 2 each step: 10 + 2 = 12.
7. Find the missing number in the sequence: 6, 8, ____, 12, 14.
10The sequence increases by 2 each step: 8 + 2 = 10.
8. Find the missing number in the sequence: 6, 11, ____, 21, 26.
16The sequence increases by 5 each step: 11 + 5 = 16.
9. Find the missing number in the sequence: 8, 13, ____, 23, 28.
18The sequence increases by 5 each step: 13 + 5 = 18.
10. Find the missing number in the sequence: 15, 16, ____, 18, 19.
17The sequence increases by 1 each step: 16 + 1 = 17.
11. Find the missing number in the sequence: 12, 14, ____, 18, 20.
16The sequence increases by 2 each step: 14 + 2 = 16.
12. Find the missing number in the sequence: 6, 7, ____, 9, 10.
8The sequence increases by 1 each step: 7 + 1 = 8.
12 questions · Seed 45 · Age guidance, not curriculum certification