When discussing finances, decimals are the most common notation utilised. For example, if someone has $3.42 in their possession, they have three whole dollars and 42/100 of a dollar. Comparing two decimals, as opposed to two fractions, is often seen as being simpler by the majority of people.

A fraction expressed using tenths and hundredths is called a decimal. It is simpler to mention that a bag of chips costs $0.99 as opposed to saying that it costs 99 cents and one hundredth of a dollar. To convert a fraction into its equivalent decimal form, just divide the top number (the numerator) of the fraction by the bottom number (the denominator). Because 0.8 is obtained by dividing four by five, the fraction 4/5 may be written as the decimal value 0.80.

John Napier, a mathematician from Scotland, is credited with being the first person to propose the use of decimals as a representation for fractions. His proposal was that the digits to the left of the decimal point should stand for whole numbers, while the digits to the right of the decimal point should stand for fractional numbers.

Numerous applications call for the usage of decimals. At gas stations, the amount of gas pumped and the price of gas are both shown in decimal form on the pump’s display screen. A person who pumps 15 gallons of petrol and the price per gallon is $3.29 would owe a total of $49.35. This indicates that he owes a total of 49 whole dollars plus 35/100 of an additional dollar. The odometer of a car also keeps track of the miles using decimals rather than whole numbers.