We are using decimals for following purpose :
Ø Money
weight
landscaping
measurements
medicine doses
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That is because if you don't, you will get the wrong answer. It is ALWAYS important to LINE up the decimals.
The decimal point is important, when dealing with money, because it differentiates $500 from $5.00. After the decimal point there will be two digits, these two digits are the number of cents (in America). The number in front of the decimal point is the number of dollars. It is very important that you put the decimal point in the right spot especially when writing checks.
It is important to have the decimal place in the correct position when doing calculations manually.
The word decimal comes from ten. So without the number 10, decimal would have no meaning.
it is important for us to learn to a decimal as a fraction because if you don't understand the way you write it in decimals you can change it into a fraction to understand it properly