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decimals are used when you have part of a whole for examle .362598798 is part of a whole
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.
Before decimals were invented, people used fractions.
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.
Decimals are used in money. There is a real difference between a 1.99 and 199.00.