An easy way to find the biggest fraction is to divide the numerator by the dominator to turn it into a decimal, a more complexed way would be to do much more work and turn all fractions into having the same dominator
is the largest fraction because it is the closest to the denominator 7. Think of it as a pizza that for some reason is cut into seven pieces, if you ate 5 pieces you ate most of the pizza. However if you cut this pizza into 12 slices and only ate 2 well you almost didn't eat much and you can continue this idea of pizza for 15/40 and 8/20.
You can also divide these numbers to see the fraction as decimals but it's not necessary.
Explanation: The word each indicates this equation will use division. We know the total is 144.50, so that will be the number being divided. 8.50 is the number 144.50 is divided by. The quotient will be represented by the variable, n.
