# Worksheet: Checking Two-Digit Subtraction Problems by Adding

In this worksheet, we will practice using addition to check subtraction and identifying the related addition equation that can be solved to check the answer.

**Q2: **

Sophia and Benjamin have been asked to solve .

Sophia solves it and gets an answer of 51.

Benjamin solves it and gets an answer of 31.

Who is correct? Use the vertical column method to find out.

- ASophia
- BBenjamin

Check your answer using the inverse operation.

What number do you add to 45 to get 96?

**Q3: **

If you know that , find the total of without calculating.

**Q4: **

What is the number that can fill in the empty places?

**Q5: **

There are 58 trees in the street. 14 trees are being cut down. How many trees will be left in the street?

*Hint*: After you subtract check your answer by adding.

**Q6: **

I think that .

Pick the number sentence I can use to check my answer.

- A
- B
- C
- D

**Q7: **

Find the number that fills in the blanks.

*Hint*: Subtract, then add to check.

**Q8: **

Find the number that fills in the blank.

*Hint*: Subtract, then add to check.

**Q9: **

A classroom has 35 students. If 13 of them are boys, how many girls are there?

Pick the equation which can be used to check your answer.

- A
- B
- C
- D
- E

**Q10: **

You know that . Is it true that ?

- AYes
- BNo