# Lesson Worksheet: Estimating Decimals Differences Mathematics • 5th Grade

In this worksheet, we will practice estimating the difference between two decimals by rounding to the nearest whole number or using compatible numbers.

Q1:

Consider this subtraction problem.

Estimate the difference by rounding each number to the nearest whole number.

Calculate the difference.

Q2:

Look at how Elizabeth estimates the sum of decimal numbers by rounding each number to the nearest whole number. She found that the sum of 3.6 and 4.27 is about 8.

Estimate the sum by rounding each number to the nearest whole number. Estimate the difference by rounding each number to the nearest whole number. Q3:

Anthony knows how to add and subtract 0, 0.25, 0.5, 0.75, and 1. Look at how he uses these numbers to help him estimate sums of decimal numbers. By rounding to the nearest multiple of 0.25, he finds that is about 1.75.

Estimate the sum by rounding each number to the nearest multiple of 0.25. Estimate the difference by rounding each number to the nearest multiple of 0.25. Q4:

Estimate by rounding each number to the nearest whole number.

Q5:

Estimate by rounding each number to the nearest whole number.

Q6:

Mia has 8.56 dollars and she spends 3.21 dollars. Estimate, by rounding each number to the nearest whole number, what remains with Mia after spending the money.

Q7:

Estimate by rounding each number to the nearest whole number.

Q8:

Estimate by deciding which of the numbers on the number line the decimals are closest to. Q9:

Ethan balanced a ball on his head for 17.48 seconds and David balanced the ball for 4.31 seconds.

Estimate the difference between the two times.

Hint: You can get a good estimate by rounding the numbers to the nearest quarter.

Q10:

A boy has 13.86 LE and his sister has 7.98 LE. What is the difference to the nearest pound between the amounts of money they have?