What is the importance of decimals to us?

Answer 1

Whole numbers are not enough to describe everything. For example, the length of a certain object - say, a table - may not be an exact number of meters - it may be more than one but less than two meters.

Answer 2

We count in tens because we have ten fingers. A decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right.

Answer 3

It has the . because without it you would get a good grade instead of a bad one looking for your answers online... stupid! Naughty, naughty student!