Estimating Sums and

Differences

To round, examine the digit to the right of the digit being

rounded.1. If this digit is greater than or equal

to 5, add one to the digit being rounded.

2. If this digit is less than 5, the digit being rounded remains unchanged.

Rounding to the nearest hundred111200 132 100

Rounding to the nearest whole number2.4 2 3.6 4

Rounding to the nearest dollar amount$165.63 $166.00 $122.23 $122.00

Rounding to the nearest Cent$143.23 $143.20

Susan is worried that she has spent too much money. She has $256 in her checking account and has written checks for $92.69, $126.32, $9.58, and $12.39.Determine if Susan has spent too much money.

Susan is worried that she has spent too much money. She has $256 in her checking account and has written checks for $92.69, $126.32, $9.58, and $12.39.Determine if Susan has spent too much money.

Round each check to the nearest dollar amount.

ExampleSusan is worried that she has spent too much money. She has $256 in her checking account and has written checks for $92.69, $126.32, $9.58, and $12.39.Determine if Susan has spent too much money.

Round each check to the nearest dollar amount. 92.69 11

ExampleSusan is worried that she has spent too much money. She has $256 in her checking account and has written checks for $92.69, $126.32, $9.58, and $12.39.Determine if Susan has spent too much money.

Round each check to the nearest dollar amount. 92.69 1111111

ExampleSusan is worried that she has spent too much money. She has $256 in her checking account and has written checks for $92.69, $126.32, $9.58, and $12.39.Determine if Susan has spent too much money.

Round each check to the nearest dollar amount. 92.69 111111111111

ExampleSusan is worried that she has spent too much money. She has $256 in her checking account and has written checks for $92.69, $126.32, $9.58, and $12.39.Determine if Susan has spent too much money.

Round each check to the nearest dollar amount. 92.69 11111111111111111

ExampleSusan is worried that she has spent too much money. She has $256 in her checking account and has written checks for $92.69, $126.32, $9.58, and $12.39.Determine if Susan has spent too much money.

Round each check to the nearest dollar amount. 92.69 11111111111111111

241

ExampleSusan is worried that she has spent too much money. She has $256 in her checking account and has written checks for $92.69, $126.32, $9.58, and $12.39.Determine if Susan has spent too much money.

Round each check to the nearest dollar amount. 92.69 11111111111111111

241Since 241 < 256, Susan has enough money in her account.

• http://www.ixl.com/math/practice/grade-6-estimate-sums-and-differences-of-decimals