1. Estimating Sums and Differences

2. 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.

3. Rounding to the nearest hundred 167  200132  100 Rounding to the nearest whole number 2.4  23.6  4 Rounding to the nearest dollar amount $165.63  $166.00$122.23  $122.00 Rounding to the nearest Cent $143.23  $143.20

4. 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.

5. 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.

6. Example 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. 92.69 

7. Example 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. 92.69  

8. Example 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. 92.69   

9. Example 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. 92.69    

10. Example 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. 92.69     241

11. Example 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. 92.69     241 Since 241 < 256, Susan has enough money in her account.

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