First we have to find the factors of 144. 144 = 2 * 2 * 2 * 2 * 3 * 3. Then we will find the pairs of numbers which product is 144. 1 * 144 = 144, 2 * 72 = 144, 3 * 48 = 144, 4 * 36 = 144, 6 * 24 = 144, 8 * 18 = 144, 9 * 16 = 144. And because of the commutative property of multiplication: 16 * 9 = 144, 18 * 8 = 144, 24 * 6 = 144, 36 * 4 = 144, 48 * 3 = 144, 48 * 3 = 144, 72 * 2 = 144 and 144 * 1 = 144.