Worksheet: Estimating Differences between Three-Digit Numbers: Rounding

In this worksheet, we will practice rounding to the nearest ten or hundred to estimate the value of differences with numbers up to 1000.

Q1:

Which number is nearest to 489162?

  • A300
  • B400
  • C500

Q2:

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.

  • A400
  • B 100
  • C300
  • D200
  • E 600

Find the exact number of houses left.

Q3:

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.

Q4:

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.

Q5:

Look at how Liam estimated this difference.

Estimate 817649 by rounding both numbers first to the nearest hundred.

Estimate 525389 by rounding both numbers first to the nearest hundred.

Q6:

Look at how Amelia estimated this difference.

Estimate these differences by rounding to the nearest ten.

Estimate 528263 by rounding both numbers first to the nearest ten.

Estimate 752178 by rounding both numbers first to the nearest ten.

Q7:

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.

Q8:

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

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

  • A300
  • B800
  • C400
  • D700

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

  • A310
  • B280
  • C300
  • D290

Find the exact answer.

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

  • A339
  • B294
  • C740
  • D348

Q9:

Which number is nearest to 400133?

  • A100
  • B300
  • C200

Q10:

Which number is nearest to 651241?

  • A400
  • B300
  • C500

Q11:

Which number is nearest to 325203?

  • A300
  • B100
  • C200

Q12:

Which number is nearest to 381162?

  • A100
  • B200
  • C300

Q13:

Which number is nearest to 553122?

  • A500
  • B400
  • C300

Q14:

Which number is nearest to 356193?

  • A300
  • B100
  • C200

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