Rounding to whole numbers and tens
In many calculations you will be expected to round off your answer to the nearest whole number or to the nearest ten.
Example
Write \(38.7\) to the nearest whole number
\(38.7\) lies between \(38\) and \(39\).
\(38.7\) is nearer to \(39\) than \(38\)
So, \(38.7 = 39\) (to the nearest whole number)
Now try the example questions.
Question
Write \(6.5\) to the nearest whole number
\(6.5\) lies between \(6\) and \(7\).
\(6.5\) lies mid-way between \(6\) and \(7\).
When this happens always round up
So, \(6.5 = 7\) (to the nearest whole number)
Question
Round \(103.4\) to the nearest ten.
\(103.4\) lies between \(100\) and \(110\)
\(103.4\) is nearer to \(100\) than \(110\)
So, \(103.4 = 100\) (to the nearest ten).