Hello and welcome to Rounding Decimals.
In this video, you'll learn how to round decimals.
We use decimals to show parts of a whole number.
They're another way to show a fraction of a whole number.
Rounding decimals uses the same rules as rounding other numbers.
Do you remember the rules of rounding?
If the number is 5 or more, you round up.
If the number is 4 or less, you round down.
If you don't remember these, watch the rounding video.
Decimals have place values, just like whole numbers.
These digits are to the right of the decimal point.
When you round decimals, you can round to a whole number,
round to the nearest tenth,
or round to the nearest hundredth.
Most of the time you'll round to the nearest tenth,
but we'll look at rounding to a whole, to a tenth, and even to a hundredth.
Let's look at how to round a number to the nearest tenth.
That means to the first digit to the right of a decimal point.
Try a few examples with me.
Our first number is 1.47.
The digit in the hundredths place is 7, so we round up.
This number rounded to the nearest tenth is 1.5.
1.64 has a 4 in the hundredths place.
4 rounds down, so this is 1.6.
2.83 also rounds down since there is a 3 in the hundredths place,
so it becomes 2.8.
Finally, 4.97 rounds up.
If we round up, this becomes 5.0.
If you have a long decimal number with numbers in the thousandths place,
you'll look at the digit in the thousandths place to see how to round.
6.431 rounds down to 6.43.
8.589 rounds up to 8.59.
And, 7.438 rounds up to 7.44.
Now you know how to round decimals to the hundredths or tenths place,
but you still need to know how to round them to the nearest whole number.
You will look at the tenths place to know which way to round.
The number 4.78 rounds up to 5 since 7 is more than 5,
and numbers greater than 5 round up.
6.24 rounds down because numbers 4 or lower round down.
9.47 rounds down to 9.
The rules of rounding are the same for decimals as they are for other numbers.
If you can remember those rules,
round up for 5 or over, and down for 4 or under,
you can round decimals just like you do whole numbers.
Keep your rounding rules in mind, and remember always be clever.