If 18 x 5 or 4 x 75 feels hard to calculate in your head, you probably weren't that good at maths. But yes, handy swap trick in general...— Homer J (AAA) (@KpunToN00b) March 5, 2019
If 18 x 5 or 4 x 75 feels hard to calculate in your head, you probably weren't that good at maths. But yes, handy swap trick in general...