Rounding Numbers
 Rounding makes numbers that are easier to work with in your head.
 Rounded numbers are only approximate.
 An exact answer generally can not be obtained using rounded numbers.
 Use rounding to get a answer that is close but that does not have to be exact.
How to round numbers
 Make the numbers that end in 1 through 4 into the next lower number that ends in 0.
For example 74 rounded to the nearest ten would be 70.
 Numbers that end in a digit of 5 or more should be rounded up to the next even ten.
The number 88 rounded to the nearest ten would be 90.

