Worked example
What is 15 − 7?
Answer & why
Answer: 8
Subtract 5 to reach 10, then 2 more to reach 8.
Grade 1 · Math
Subtract within twenty
Use subtraction to find a difference within twenty.
8 generated examples + worked example
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8 reproducible examples from this math generator. Choose New examples for another set.
Question 1
What is 14 − 1?
- 16
- 12
- 17
- 13
A hint
Use place value or a known fact; estimate before choosing.
Answer & why
Answer: 13
14 − 1 = 13. Check by adding 1 back.
Question 2
What is 13 − 6?
- 7
- 5
- 10
- 8
A hint
Use place value or a known fact; estimate before choosing.
Answer & why
Answer: 7
13 − 6 = 7. Check by adding 6 back.
Question 3
What is 16 − 10?
- 8
- 7
- 10
- 6
A hint
Use place value or a known fact; estimate before choosing.
Answer & why
Answer: 6
16 − 10 = 6. Check by adding 10 back.
Question 4
What is 16 − 16?
- 3
- 0
- 2
- 4
A hint
Use place value or a known fact; estimate before choosing.
Answer & why
Answer: 0
16 − 16 = 0. Check by adding 16 back.
Question 5
What is 13 − 12?
- 3
- 1
- 2
- 0
A hint
Use place value or a known fact; estimate before choosing.
Answer & why
Answer: 1
13 − 12 = 1. Check by adding 12 back.
Question 6
What is 20 − 12?
- 6
- 12
- 8
- 10
A hint
Use place value or a known fact; estimate before choosing.
Answer & why
Answer: 8
20 − 12 = 8. Check by adding 12 back.
Question 7
What is 11 − 7?
- 8
- 5
- 4
- 7
A hint
Use place value or a known fact; estimate before choosing.
Answer & why
Answer: 4
11 − 7 = 4. Check by adding 7 back.
Question 8
What is 20 − 4?
- 18
- 16
- 15
- 20
A hint
Use place value or a known fact; estimate before choosing.
Answer & why
Answer: 16
20 − 4 = 16. Check by adding 4 back.