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Friday, October 28, 2011

Rounding Decimals!


Rounding Decimal Numbers

hundreds
tens
ones

tenths
hundredths
thousandths
ten-thousandths
hundred-thousandths
millionths
ten-millionths

3
4
.
0
5
9
2




How do we round a decimal number?  Let’s use an example to help illustrate the process…

Example:  Round 34.0592 to the nearest hundredth(The number is written in chart.)

Step 1Identify the place value that we are rounding to and place a square around that digit.

              34.0592

Step 2Look at the digit to the right of the boxed number and determine if the number is a low number or a high number.

               34.0592                                                           low numbers  high numbers
                                                                                         0   1   2   3   4      5   6   7   8   9

Step 3If the number to the right is a low number, the boxed number stays the same.  If the number to the right is a high number, the boxed number is rounded up one.
                                                                                                                9 is a high number, so we change
34.0592                                                        the 5 into a 6

Step 4Drop all the digits to the right of the boxed number. 

                34.06

Tonight's homework is to complete both sides of the rounding worksheet.  You should have come close to finishing during class!

Want to practice?  Try playing this game!

Have a great weekend!  Enjoy the snow if it comes!

-Miss K  :)

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