Nagwa uses cookies to ensure you get the best experience on our website. Learn more about our Privacy Policy.

Start Practicing

Worksheet: Estimating Differences between Three-Digit Numbers

Q1:

Which number is nearest to 4 8 9 1 6 2 ?

  • A500
  • B400
  • C300

Q2:

Which number is nearest to 4 0 0 1 3 3 ?

  • A200
  • B100
  • C300

Q3:

Which number is nearest to 6 5 1 2 4 1 ?

  • A500
  • B300
  • C400

Q4:

Which number is nearest to 3 2 5 2 0 3 ?

  • A300
  • B200
  • C100

Q5:

Which number is nearest to 3 8 1 1 6 2 ?

  • A300
  • B100
  • C200

Q6:

Which number is nearest to 5 6 2 2 0 3 ?

  • A500
  • B300
  • C400

Q7:

Which number is nearest to 2 6 5 1 2 9 ?

  • A300
  • B200
  • C100

Q8:

Ethan has to deliver mail to 415 houses. He delivered it to 82 houses in one street and 107 houses in another.

Pick the best estimate for the number of houses he still has to deliver mail to.

  • A 600
  • B300
  • C400
  • D200
  • E 100

Find the exact number of houses left.

Q9:

Look at this calculation.

Estimate the answer by rounding both numbers to the nearest hundred.

Estimate the answer by rounding both numbers to the nearest ten.

Calculate the exact answer.

Tip: Use the estimates to see if your answer is sensible.

Q10:

Look at how David rounded to estimate this difference.

Round the numbers in this calculation to the nearest hundred.

  • A
  • B
  • C
  • D

Calculate the estimate.

Q11:

Look at how Liam estimated this difference.

Estimate 8 1 7 6 4 9 by rounding both numbers first to the nearest hundred.

Estimate 5 2 5 3 8 9 by rounding both numbers first to the nearest hundred.

Q12:

Look at how Victoria rounded to estimate this difference.

Round the numbers in this calculation to the nearest hundred.

  • A
  • B
  • C
  • D

Calculate the estimate.

Q13:

Chloe and Benjamin are going on vacation. Chloe has to travel 223 miles, while Benjamin has to travel 517 miles.

Which calculation do you need to solve to figure out how many more miles Benjamin has to travel than Chloe?

  • A 5 7 1 2 2 3
  • B 5 1 7 + 2 2 3
  • C 5 7 1 + 2 2 3
  • D 5 1 7 2 2 3

Estimate the answer by rounding both numbers to the nearest hundred.

  • A800
  • B400
  • C700
  • D300

Estimate the answer by rounding both numbers to the nearest ten.

  • A300
  • B290
  • C280
  • D310

Find the exact answer.

Tip: Use the estimates to see if your answer is sensible.

  • A294
  • B740
  • C348
  • D339

Q14:

Look at how Amelia estimated this difference.

Estimate these differences by rounding to the nearest ten.

Estimate 5 2 8 2 6 3 by rounding both numbers first to the nearest ten.

Estimate 7 5 2 1 7 8 by rounding both numbers first to the nearest ten.