Question

Martin is pasting pieces of square colored paper of equal size onto a board measuring 72 cm by 90 cm. If only whole square pieces are used, and the board is to be completely covered, find the largest possible length of the side of each square colored paper.

Answer 1

So if you divide 72 by 4, you get 18; and then if you divide 90 by 5 you get 18. So those are the smallest possible dividends, and your answer for the largest possible length of the side of each square would be 18 cm.