Whenever the numbers that I need to work with are not integers.
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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.
It is important because depending on the problem it is easier to use fractions or decimals. Sometimes the problem is asking for an exact answer, in which case you would keep it in fraction form.
decimals are most commonly seen in money.
fractions are just decimals in a different form.A cereal box has decimals on its network
no because that is stupid and decimals are for numbers