Numbers with one decimal place have one digit after the decimal point.
To round one of these numbers to the nearest whole number, think of a number line.
Remember that halfway numbers such as 7.5 or 8.5 or 14.5 always round up.
Numbers ending in 1, 2, 3 and 4 round down.
Numbers above this, such as 5, 6, 7, 8 and 9 round up.
Example 1
Round 12.3 to the nearest whole number.
Answer
12.3 is between 12 and 13 and is closer to 12.
12.3 rounds down to 12.
Example 2
Round 10.8 to the nearest whole number.
Answer
10.8 is between 10 and 11 and is closer to 11.
10.8 rounds up to 11.
Example 3
Round 16.5 to the nearest whole number.
Answer
16.5 is halfway between 16 and 17 and so we round up.
16.5 rounds up to 17.
Are you happy with all that?
Let's get started.