99 2 = (90 + 9) 2 = 90 2 + 9 2 = 180 + 18 = 198897 7 = (800 + 90 + 7) 7 = 800 7 + 90 7 + 7 7 = 5600 + 630 + 49 = 6279403 6 = (400 + 3) 6 = 400 6 + 3 6 = 2400 + 18 = 24182 (150 - 5) = 2 * 145 = 290
99 2 = (90 + 9) 2 = 90 2 + 9 2 = 180 + 18 = 198
897 7 = (800 + 90 + 7) 7 = 800 7 + 90 7 + 7 7 = 5600 + 630 + 49 = 6279
403 6 = (400 + 3) 6 = 400 6 + 3 6 = 2400 + 18 = 2418
2 (150 - 5) = 2 * 145 = 290