Scientific American presentsMath Dudeby Quick & Dirty Tips. Scientific American and Quick & Dirty Tips are both Macmillan companies. In the last Math Dude episode, we learned the ins and outs of ...

Use rounded values to estimate close the answer to a calculation. This is a useful non-calculator skill. Refresh your knowledge with these guides on rounding and significant figures. Rounding to ...

It’s so tempting to round off numbers and present your audience with pretty whole numbers rather than cluttering up the text with decimal points and a string of digits. Sometimes rounding a number up ...

Imagine needing to estimate the total cost of the items in your grocery basket to decide whether to put something back. So you round to the nearest dollar for each potential purchase, using the “round ...