# 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.

**Q2: **

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 Liam estimated this difference.

Estimate by rounding both numbers first to the nearest hundred.

Estimate by rounding both numbers first to the nearest hundred.

**Q5: **

Look at how Amelia estimated this difference.

Estimate these differences by rounding to the nearest ten.

Estimate by rounding both numbers first to the nearest ten.

Estimate by rounding both numbers first to the nearest ten.

**Q7: **

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
- B
- C
- D

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

- A300
- B700
- C800
- D400

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

- A310
- B300
- C290
- D280

Find the exact answer.

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

- A348
- B339
- C740
- D294

**Q14: **

Estimate by rounding to the nearest hundred.

**Q15: **

True or False: If I estimate by rounding to the nearest hundred I will find that the difference is about 300.

- ATrue
- BFalse