# 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 ?

• A500
• B400
• C300

Q2:

Look at how Jackson rounded to estimate this difference. Round the numbers in this calculation to the nearest ten. • A • B • C • D Calculate the estimate.

Q3:

Look at how Olivia 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 Benjamin 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 Mia 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.

Q6:

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.

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

• A348
• B339
• C740
• D294

Q8:

Which number is nearest to ?

• A200
• B100
• C300

Q9:

Which number is nearest to ?

• A500
• B300
• C400

Q10:

Which number is nearest to ?

• A300
• B200
• C100

Q11:

Which number is nearest to ?

• A300
• B100
• C200

Q12:

Which number is nearest to ?

• A500
• B300
• C400

Q13:

Which number is nearest to ?

• A300
• B100
• C200

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

Q16:

Which number is nearest to ?

• A600
• B500
• C400

Q17:

Which is true?

• A
• B
• C