Worksheet: Estimating Decimals Differences

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. 75.4332.19

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

Calculate the difference.

Check that your answer is reasonable using your estimate.

Q2:

Look at how Jennifer 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 1.31+0.42 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 12.4610.57 by rounding each number to the nearest whole number.

Q5:

Estimate 15.48.62 by rounding each number to the nearest whole number.

Q6:

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

Q7:

Estimate 17.59.1 by rounding each number to the nearest whole number.

Q8:

Estimate 15.7112.47 by deciding which of the numbers on the number line the decimals are closest to.

Q9:

Estimate 6.692.41 by rounding each number to the nearest 0.25, 0.50, and 0.75.

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