Sunday, April 6, 2014

How to Round Whole Numbers and Decimals


Rounding a number is the easiest thing you learn in math once you know the basics of it.
When rounding  a  whole number, first specify if the number is in the ones, tens, hundreds, etc.
Then you have to see whether the number's midpoint is below or above five, fifty, or five hundred, etc.
If the number is above, then round to greater number if the number is below then round to the smaller number.

For example the number is 22, so I know that this number is in the tens and that the midpoint is twenty five. Now the two points I can round 22 is 20 and 30. I know that 22 is less than 25 so I will round below to 20.

Same thing with rounding decimals. If the decimal number is greater than 5 tenths, 5 hundredths, or 5 thousandths etc, then round up. Otherwise, round below. So if I had the decimal number .54 I know it is in hundredths place so I can round to either .50 or .60. $ is less than so we'll round to .50!

To understand this topic better I suggest watching the video......And trying some of these out.

Sheet 1 Rounding Whole Numbers and Decimals

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