# Worksheet: Estimating Differences between Three-Digit Numbers

In this worksheet, we will practice estimating the result of three-digit-number subtraction.

**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 Amir estimated this difference.

Estimate by rounding both numbers first to the nearest hundred.

Estimate 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 by rounding both numbers first to the nearest ten.

Estimate 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: **

Samar and Maged are going on vacation. Samar has to travel 223 miles, while Maged has to travel 517 miles.

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

- A
- B
- C
- D

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