The $130 fishing rod was first marked down 40 percent, and now it’s an additional 25 percent off. How much will it end up costing? If you’re not sure how to go about figuring this out, you’re not ...

Scientific American presents Math Dude by Quick & Dirty Tips. Scientific American and Quick & Dirty Tips are both Macmillan companies. Long time math fans may remember our first foray into the world ...

Fast Percentage calculations in mind using Mental Maths: Calculate almost any percentage in your mind. Simple tricks to calculate percentages like 10%, 20%, 75% and more mentally. This is useful for ...

An amount can be increased or decreased by a certain percentage to change its size. A reverse percentage problem involves finding the original amount before a percentage increase or decrease. The ...