In most countries to separately deal with major currency units Pounds, Euros, Dollars etc, from the minor units: pence, cents, cents.
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You can use decimals in money.
A math teacher or a mathematician.
Decimals are used in money. There is a real difference between a 1.99 and 199.00.
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.
The Chinese were the first to use decimals. Decimals were developed and used in the 1st century B.C. in China and then spread to the Middle East and Europe.