Rounding to the nearest whole number

In many calculations you will be expected to round off your answer to the nearest whole number or to the nearest ten.

Example 1

Write 38.7 to the nearest whole number

Number line showing 38, 38.5 and 39.  38.7 is marked with a bead.

38.7 lies between 38 and 39

38.7 is nearer to 39 than 38

So, 38.7 = 39 (to the nearest whole number)

Example 2

Write 6.5 to the nearest whole number

Number line from 6 to 7, showing 6.5 as mid-way.

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)

Now try this question:

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).

Number line from 100 to 110, showing 105 as midway.  A bead marks 103.4.