HOW TO FIND FRACTION OF A SET 2020

When I am doing maths my teacher would normally give us decimals or fractions. We did fractions for this week, for fractions we had to find fraction as a set. So if you are confused on how to find a fraction in a set you are looking at the right thing. HERE IS AN EXAMPLE: There are 24 hours in a day and scientists tell us that we should sleep for 3/8 of the day, How much time should we sped sleeping? 

First you would find what the whole number is which is 24 we are going to be finding our fraction as well which is 3/8. In the fraction the bottom number in maths you would call that a denominator you would divide the whole number with the denominator 24÷8=3 with that 3 you are gonna times that with the numerator 3x3=9 and that's your answer. GOOD LUCK IF YOU HAVE ANY WORK TO DO WITH FINDING FRACTIONS OF A SET!! :)