Khan academy how do you change a fraction into a decimal using long division

Just use your calculator to divide the numerator, or the top number, of thefraction by the denominator, or the bottom number of the fraction. In this example, 3/4, simply press "3" followed by the division symbol ("÷'") followed by 4 and then the equal sign ("=") to get your answer. Write down your answer.

Original price of the box was $2.00
Discount of 25%. 75% ___ $ 1.50
Original price.      100%___ $ ((1.50/75)*100) = $2.00