Rounding and Estimating Numbers

You can _______ a number to find an estimate.

• multiply

• add

• round

• change

Round 72,957 to the nearest thousand.

• 70,000

• 72,000

• 72,900

• 73,000

Alex and Tobby are cousins. They have a big collection of marbles. In their collection they have 6,293 marbles. Round this number to the nearest hundred.

• 6,300

• 6,000

• 6,200

• 6,290

An ___________ tells you about how many or about how much. It is close to an exact amount.

• standard form

• word form

• place value

• estimate

Estimate the sum of 489 and 367 by rounding to the nearest hundred.

• 800

• 900

• 850

Estimate the sum of 489 and 267 by rounding to the nearest hundred before adding.

• 700

• 750

• 800

• 850

Estimate the difference between 2,456 and 1,123 by rounding to the nearest thousand before subtracting.

• 1,000

• 1,500

• 2,000

• 2,500

Estimate the difference between 2,456 and 1,232 by rounding to the nearest thousand.

• 1,000

• 2,000

• 500

Estimate the product of 298 and 47 by rounding to the nearest ten.

• 15,000

• 13,000

• 13,860

Rounding means...

• finding the exact answer.

• always making a number smaller.

• always making a number bigger.

• making a number simpler, but keeping its value closer to what it was.