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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: 3, 4, ____, 6, 7.
2. Find the missing number in the sequence: 7, 8, ____, 10, 11.
3. Find the missing number in the sequence: 18, 20, ____, 24, 26.
4. Find the missing number in the sequence: 17, 22, ____, 32, 37.
5. Find the missing number in the sequence: 4, 5, ____, 7, 8.
6. Find the missing number in the sequence: 20, 25, ____, 35, 40.
7. Find the missing number in the sequence: 16, 18, ____, 22, 24.
8. Find the missing number in the sequence: 10, 12, ____, 16, 18.
9. Find the missing number in the sequence: 8, 13, ____, 23, 28.
10. Find the missing number in the sequence: 5, 7, ____, 11, 13.
11. Find the missing number in the sequence: 12, 17, ____, 27, 32.
12. Find the missing number in the sequence: 15, 20, ____, 30, 35.
12 questions · Seed 72 · 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: 3, 4, ____, 6, 7.
5The sequence increases by 1 each step: 4 + 1 = 5.
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: 18, 20, ____, 24, 26.
22The sequence increases by 2 each step: 20 + 2 = 22.
4. Find the missing number in the sequence: 17, 22, ____, 32, 37.
27The sequence increases by 5 each step: 22 + 5 = 27.
5. Find the missing number in the sequence: 4, 5, ____, 7, 8.
6The sequence increases by 1 each step: 5 + 1 = 6.
6. Find the missing number in the sequence: 20, 25, ____, 35, 40.
30The sequence increases by 5 each step: 25 + 5 = 30.
7. Find the missing number in the sequence: 16, 18, ____, 22, 24.
20The sequence increases by 2 each step: 18 + 2 = 20.
8. Find the missing number in the sequence: 10, 12, ____, 16, 18.
14The sequence increases by 2 each step: 12 + 2 = 14.
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: 5, 7, ____, 11, 13.
9The sequence increases by 2 each step: 7 + 2 = 9.
11. Find the missing number in the sequence: 12, 17, ____, 27, 32.
22The sequence increases by 5 each step: 17 + 5 = 22.
12. Find the missing number in the sequence: 15, 20, ____, 30, 35.
25The sequence increases by 5 each step: 20 + 5 = 25.
12 questions · Seed 72 · 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: 3, 4, ____, 6, 7.
2. Find the missing number in the sequence: 7, 8, ____, 10, 11.
3. Find the missing number in the sequence: 18, 20, ____, 24, 26.
4. Find the missing number in the sequence: 17, 22, ____, 32, 37.
5. Find the missing number in the sequence: 4, 5, ____, 7, 8.
6. Find the missing number in the sequence: 20, 25, ____, 35, 40.
7. Find the missing number in the sequence: 16, 18, ____, 22, 24.
8. Find the missing number in the sequence: 10, 12, ____, 16, 18.
9. Find the missing number in the sequence: 8, 13, ____, 23, 28.
10. Find the missing number in the sequence: 5, 7, ____, 11, 13.
11. Find the missing number in the sequence: 12, 17, ____, 27, 32.
12. Find the missing number in the sequence: 15, 20, ____, 30, 35.
12 questions · Seed 72 · 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: 3, 4, ____, 6, 7.
5The sequence increases by 1 each step: 4 + 1 = 5.
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: 18, 20, ____, 24, 26.
22The sequence increases by 2 each step: 20 + 2 = 22.
4. Find the missing number in the sequence: 17, 22, ____, 32, 37.
27The sequence increases by 5 each step: 22 + 5 = 27.
5. Find the missing number in the sequence: 4, 5, ____, 7, 8.
6The sequence increases by 1 each step: 5 + 1 = 6.
6. Find the missing number in the sequence: 20, 25, ____, 35, 40.
30The sequence increases by 5 each step: 25 + 5 = 30.
7. Find the missing number in the sequence: 16, 18, ____, 22, 24.
20The sequence increases by 2 each step: 18 + 2 = 20.
8. Find the missing number in the sequence: 10, 12, ____, 16, 18.
14The sequence increases by 2 each step: 12 + 2 = 14.
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: 5, 7, ____, 11, 13.
9The sequence increases by 2 each step: 7 + 2 = 9.
11. Find the missing number in the sequence: 12, 17, ____, 27, 32.
22The sequence increases by 5 each step: 17 + 5 = 22.
12. Find the missing number in the sequence: 15, 20, ____, 30, 35.
25The sequence increases by 5 each step: 20 + 5 = 25.
12 questions · Seed 72 · Age guidance, not curriculum certification