1) 2 = 2 3 = 3 2 * 3 = 6 2) 9 = 3 * 3 12 = 3 * 2 * 2 3 * 3 * 2 * 2 = 36 3) 6 = 2 * 3 8 = 2 * 2 * 2 2 * 3 * 2 * 2 = 24 4) 15 = 3 * 5 21 = 3 * 7 3 * 5 * 7 = 105