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In this lesson, we will learn how to estimate the result of three-digit-number subtraction.

Q1:

Which number is nearest to 4 8 9 − 1 6 2 ?

Q2:

Which number is nearest to 4 0 0 − 1 3 3 ?

Q3:

Which number is nearest to 6 5 1 − 2 4 1 ?

Q4:

Which number is nearest to 3 2 5 − 2 0 3 ?

Q5:

Which number is nearest to 3 8 1 − 1 6 2 ?

Q6:

Which number is nearest to 5 6 2 − 2 0 3 ?

Q7:

Which number is nearest to 2 6 5 − 1 2 9 ?

Q8:

Sherif has to deliver mail to 415 houses. He delivered it to 82 houses in one street and 107 houses in another.

Pick the best estimate for the number of houses he still has to deliver mail to.

Find the exact number of houses left.

Q9:

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.

Q10:

Look at how David rounded to estimate this difference.

Round the numbers in this calculation to the nearest hundred.

Calculate the estimate.

Q11:

Look at how Amir estimated this difference.

Estimate by rounding both numbers first to the nearest hundred.

Q12:

Look at how Victoria rounded to estimate this difference.

Q13:

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?

Find the exact answer.

Q14:

Look at how Amelia estimated this difference.

Estimate these differences by rounding to the nearest ten.

Estimate 5 2 8 − 2 6 3 by rounding both numbers first to the nearest ten.

Estimate 7 5 2 − 1 7 8 by rounding both numbers first to the nearest ten.

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