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Because some numbers cannot be expressed as terminating decimals.
If you had to write 1/3 as a decimal, without rounding, you would have to spend an infinite amount of time writing one three after another.
Also, when you're dealing with measures you reach a point where more decimal places aren't useful because you can't determine them on your measuring instrument. For example you can't measure 3.45829 inches on a ruler. But 3.5 inches works. The same is true in finance. Most of the time two decimal places is all you can work with.
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What is an easy way of explaining why rounding is useful in maths?
To estimate numbers more easily.
What is the purpose of rounding numbers?
the purpose of rounding numbers is that you can get closer to the actual answer
How are you rounding whole numbers and decimals?
rounding whole numbers and decimals
How is rounding whole numbers and decimals similar?
Is the rounding is skidding
What is estimating NOT as helpful when multiplying very small numbers?
It is - if you use appropriate rounding. Rounding does not have to be to whole numbers.
