When 2 fractions refer to the same whole and have the same denominators explain why you can compare only the numerators

Adam drew two same size rectangles and divided them into the same number of equal parts. he shaded 1/3 of one rectangle and 1/4 of the other rectangle. what is the least number of parts into which both rectangles could be divided into?

Problem fathi wants to print out a pdf document that is 48 pages long. to save paper, he decides to print on both sides of each sheet and to print two pages on each side of the sheet. how many sheets of paper will he need?

The volume of a cube-shaped shipping container is 13,824 cubic inches. find the edge length of the shipping container.