Because when u are solving an equation u wouldn't always get a whole number so that's kinda what a decimal represents
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The decimal was invented because it was more accurate than the fraction. Example: 1/3 of 100 is 33.33333333333333 and to the end of time. Infinite 3s is much more accurate than saying 1/3.
Decimals were probably invented when we didn't have any way of showing parts of numbers.
No.
He invented decimals
a European mathematician did it two or three centuries ago. before then they used fractions instead of decimals.
It is thought that decimal numbers were used by the Elamite dynasty (Iran) approx 5000 (+/- 500) years ago.