Numbers were first used, supposedly, by cave men, for archeologists discovered carvings on bones that indicated the use of numerals. However, it is not certain that this is the thing that they were used for. Therefore, Roman numerals would be the first time they were used. The reason as to why is their invention of money.
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Scientific notation is used to compute very large or very small numbers.
Most probably way back in pre-history.
Prime numbers are used to find the LCM of numbers Prime numbers are used to find the HCF of numbers Prime numbers are used to simplify fractions Prime numbers are used to find the LCD of fractions
Two numbers: the first of them is 1 and the second is not!Two numbers: the first of them is 1 and the second is not!Two numbers: the first of them is 1 and the second is not!Two numbers: the first of them is 1 and the second is not!