Estimating and Checking 3-Digit Subtraction Skills

A store had 540 toys. They sold 230 toys. How many toys are left? Estimate the difference first.

• 250

• 310

• 300

• 400

There are 760 books in a library. If 150 books are checked out, how many books remain? Check your subtraction by adding the difference to the number checked out.

• 610

• 760

• 500

• 6100

A farmer had 890 apples. He gave away 320 apples to a food bank. How many apples does he have now? Estimate the difference before calculating.

• 570

• 650 apples

• 600 apples

• 570 apples

A school had 450 students. If 120 students moved away, how many students are still at the school? Verify your answer by checking the subtraction.

• 450

• 330

• 300

• 400

A bakery made 630 cookies. They sold 250 cookies. How many cookies are left? First, estimate how many cookies were sold.

• 380 cookies

• 400 cookies

• 450 cookies

• 300 cookies

A zoo had 720 visitors in the morning and 310 in the afternoon. How many visitors were there in total? Check your work by adding the two groups together.

• 800

• 950

• 1030

• 1200

A toy factory produced 850 toys this month. If 470 toys were shipped out, how many toys are still in the factory? Estimate the difference to help you check your answer.

• 380

• 400

• 350

• 450

A library had 540 magazines. If 230 magazines were donated, how many magazines does the library have now? Estimate the difference to see if your answer is reasonable.

• 770

• 230

• 1000

• 540

A concert had 900 tickets available. If 450 tickets were sold, how many tickets are left? Check your answer by adding the sold tickets to the remaining tickets.

• 750

• 450

• 300

• 600

A school had 670 pencils. If 150 pencils were given to students, how many pencils are left? Estimate the difference to confirm your answer.

• 300

• 450

• 600

• 520