Decimals are used in money. There is a real difference between a 1.99 and 199.00.
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You can use decimals in money.
price of goods
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".
Decimals are used when you are displaying a stop watch and time. Decimals are used you are counting money. They are used when gas stations display gas prices. They are used on receipts for purchases. They are also used when you are telling someone's weight.