Scientific American presents Math Dude by Quick & Dirty Tips. Scientific American and Quick & Dirty Tips are both Macmillan companies. So far we've talked about the big ideas behind significant ...

Sometimes we do not always need to give detailed answers to problems - we just want a rough idea. When we are faced with a large number, we could round it off to the nearest thousand, or nearest ...

Scientific American presentsMath Dudeby Quick & Dirty Tips. Scientific American and Quick & Dirty Tips are both Macmillan companies. Did you know that your calculator occasionally lies to you? Okay, ...

The first two significant figures are 5 and 2. As the next digit is 4 the 2 stays as it is. Therefore 5246 rounds to 5200 to 2 significant figures. (Notice that we must put in zeros to keep the number ...