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## Rounding Whole Number & Decimals

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**Rounding & Estimating**• In our everyday lives we do not always need exact numbers or exact calculations. • We often use estimations that we get by rounding off numbers**A marine biologist estimates that there are 3 000 000**jack-fish in a lake You estimate that your total grocery bill will be $75 before you get to the check out You parents estimate your vacation expenses before you go on vacation as shown on the next slide Examples**Expected Vacation Expenses for a One Week Period**TOTAL = $1750 (approximately) It would be impossible to calculate the actual cost before the trip, so you use estimates.**To Round… (write this as a note in your notebook!)**• Look at the digit to the right of the place to which you are rounding • If the digit is 5 or greater, add 1 to the place digit • If the digit is less than 5, leave the place digit as is • Change all the digits to the right of the place digit to 0.**Round to nearest hundred**• Is the number in the tens column 5 or greater? • Yes • Change the 3 in the hundreds column to a 4 and the remaining numbers become 0s. • 1 342 400.0000 or 1 342 400**Practice**• http://www.funbrain.com/tens/index.html • Practice • http://www.aaastudy.com/