Decimals are part of arithmetic, in which the answer is expressed without vulgar fractions. Found in many fields of endeavour, - engineering, medicine, astronomy, nuclear physics ... . Indeed any field where calculations are used.
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You can use decimals in money.
There are many ways that people use decimals. One may encounter decimals when weighing fruits and vegetables at the grocery store. Decimals are also often used when keeping time, during a track meet or a marathon, for instance.
Decimals are used in money. There is a real difference between a 1.99 and 199.00.
counting money
In most countries, you will use them when you handle money, as in $2.50. Quantities on products are also sometimes expressed in decimals, e.g. "1.5 kilograms" or "2.2 liters".