Kathleen, penny, and megan all order 12-ounce smoothies. after 5 minutes, kathleen still has 3/4 left, penny has 5/6 left, and megan has 5/8 left. who has the least amount of smoothie in their cup? who has the greatest? its a hard word problem for a 4th grader plz !

Penny has the most left of her smoothie
you have to find the common denominator(number that all of the denominators are divisible into.
the common denominator is 24
convert all the fraction accordingly 
Kathleen has 9/24 smoothie
penny has 20/24 smoothie
megan has 15/24 smoothie

You didn’t put the necessary image to solve the question : p

31 is prime. and it’s prime factorization is just 31.