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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: 4, 6, ____, 10, 12.
2. Find the missing number in the sequence: 15, 20, ____, 30, 35.
3. Find the missing number in the sequence: 10, 11, ____, 13, 14.
4. Find the missing number in the sequence: 7, 12, ____, 22, 27.
5. Find the missing number in the sequence: 1, 3, ____, 7, 9.
6. Find the missing number in the sequence: 9, 14, ____, 24, 29.
7. Find the missing number in the sequence: 12, 14, ____, 18, 20.
8. Find the missing number in the sequence: 20, 21, ____, 23, 24.
9. Find the missing number in the sequence: 19, 24, ____, 34, 39.
10. Find the missing number in the sequence: 15, 17, ____, 21, 23.
11. Find the missing number in the sequence: 4, 9, ____, 19, 24.
12. Find the missing number in the sequence: 19, 20, ____, 22, 23.
12 questions · Seed 66 · 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: 4, 6, ____, 10, 12.
8The sequence increases by 2 each step: 6 + 2 = 8.
2. Find the missing number in the sequence: 15, 20, ____, 30, 35.
25The sequence increases by 5 each step: 20 + 5 = 25.
3. Find the missing number in the sequence: 10, 11, ____, 13, 14.
12The sequence increases by 1 each step: 11 + 1 = 12.
4. Find the missing number in the sequence: 7, 12, ____, 22, 27.
17The sequence increases by 5 each step: 12 + 5 = 17.
5. Find the missing number in the sequence: 1, 3, ____, 7, 9.
5The sequence increases by 2 each step: 3 + 2 = 5.
6. Find the missing number in the sequence: 9, 14, ____, 24, 29.
19The sequence increases by 5 each step: 14 + 5 = 19.
7. Find the missing number in the sequence: 12, 14, ____, 18, 20.
16The sequence increases by 2 each step: 14 + 2 = 16.
8. Find the missing number in the sequence: 20, 21, ____, 23, 24.
22The sequence increases by 1 each step: 21 + 1 = 22.
9. Find the missing number in the sequence: 19, 24, ____, 34, 39.
29The sequence increases by 5 each step: 24 + 5 = 29.
10. Find the missing number in the sequence: 15, 17, ____, 21, 23.
19The sequence increases by 2 each step: 17 + 2 = 19.
11. Find the missing number in the sequence: 4, 9, ____, 19, 24.
14The sequence increases by 5 each step: 9 + 5 = 14.
12. Find the missing number in the sequence: 19, 20, ____, 22, 23.
21The sequence increases by 1 each step: 20 + 1 = 21.
12 questions · Seed 66 · 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: 4, 6, ____, 10, 12.
2. Find the missing number in the sequence: 15, 20, ____, 30, 35.
3. Find the missing number in the sequence: 10, 11, ____, 13, 14.
4. Find the missing number in the sequence: 7, 12, ____, 22, 27.
5. Find the missing number in the sequence: 1, 3, ____, 7, 9.
6. Find the missing number in the sequence: 9, 14, ____, 24, 29.
7. Find the missing number in the sequence: 12, 14, ____, 18, 20.
8. Find the missing number in the sequence: 20, 21, ____, 23, 24.
9. Find the missing number in the sequence: 19, 24, ____, 34, 39.
10. Find the missing number in the sequence: 15, 17, ____, 21, 23.
11. Find the missing number in the sequence: 4, 9, ____, 19, 24.
12. Find the missing number in the sequence: 19, 20, ____, 22, 23.
12 questions · Seed 66 · 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: 4, 6, ____, 10, 12.
8The sequence increases by 2 each step: 6 + 2 = 8.
2. Find the missing number in the sequence: 15, 20, ____, 30, 35.
25The sequence increases by 5 each step: 20 + 5 = 25.
3. Find the missing number in the sequence: 10, 11, ____, 13, 14.
12The sequence increases by 1 each step: 11 + 1 = 12.
4. Find the missing number in the sequence: 7, 12, ____, 22, 27.
17The sequence increases by 5 each step: 12 + 5 = 17.
5. Find the missing number in the sequence: 1, 3, ____, 7, 9.
5The sequence increases by 2 each step: 3 + 2 = 5.
6. Find the missing number in the sequence: 9, 14, ____, 24, 29.
19The sequence increases by 5 each step: 14 + 5 = 19.
7. Find the missing number in the sequence: 12, 14, ____, 18, 20.
16The sequence increases by 2 each step: 14 + 2 = 16.
8. Find the missing number in the sequence: 20, 21, ____, 23, 24.
22The sequence increases by 1 each step: 21 + 1 = 22.
9. Find the missing number in the sequence: 19, 24, ____, 34, 39.
29The sequence increases by 5 each step: 24 + 5 = 29.
10. Find the missing number in the sequence: 15, 17, ____, 21, 23.
19The sequence increases by 2 each step: 17 + 2 = 19.
11. Find the missing number in the sequence: 4, 9, ____, 19, 24.
14The sequence increases by 5 each step: 9 + 5 = 14.
12. Find the missing number in the sequence: 19, 20, ____, 22, 23.
21The sequence increases by 1 each step: 20 + 1 = 21.
12 questions · Seed 66 · Age guidance, not curriculum certification