You need decimals when you measure and fractions. You need decimals, because to measure and fractions. Also, so whole numbers could exist if there are decimals. There will be no math if there's no decimals.
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Accountants use decimals by simply dividing the fractions and getting a decimal number. One does not need to be an accountant to use decimals.
You need to line up decimals for additional and subtraction. For multiplication, you don't need to line them up - in fact, it would serve no useful purpose.
You determine the least to greatest in decimals by using their leftmost unit. The decimal 0.2 is less than 0.3. To determine fractions, you need to first convert them to decimals.
Whenever the numbers that I need to work with are not integers.
Nothing. I know all that I need to know.