In this lesson we're going learn rounding off decimals. Rounding off decimal is same as rounding off whole number, only the difference is we have to round of the tenth, hundredth and thousandth etc.
When you're rounding off the decimal, always check the next decimal place because it depends on the number at the next decimal place whether it rounds off or round down.
Just for revision, we round off a number when the number is 5 or higher (i.e add 1),
if the number is less than 5 we round down.
1. Round off 85.3176 to 2 decimal places.
Check the third decimal place (7). now this is higher than 5, we must round up which it means add 1 to the number 1.
Therefore the answer is 85.32.
* Another way to say is "Round off to the nearest hundredth."
2. Round off 102.537 to 1 decimal place.
Look at the second decimal place, which is 3 and this is smaller than 5, it must be rounded down.
Therefore the answer is 102.5.
* Another way to say is "Round off to the nearest tenth."
No comments:
Post a Comment