That&#x27;s a trivial calculation to do, so I think it would be hard to make a mistake. I think you could have provided a better example.<p>Edit:<p>To the poster below, you only need the multiplication tables and basic addition. I don&#x27;t see the big deal.<p>18 * 10 = 180<p>10 * 6 = 60<p>8 * 6 = 48<p>= 288