Arectangular board measures 126 cm by 90 cm it can be divided into squares of equal size. find the least number of squares the game board can be divided into.

A square has the same width and height, so find the gcd of 90 and 126. Here are there factors:
90:1,2,3,5,9,10,15,18,30,45,90
126:2,3,6, 7,9,14,18,21,42,63,126
18 is the largest in both so the number of squares will be
90/18 * 126/18
= 5*7 = 35