Rounding helps us to quickly estimate answers before working them out. Always look at the digit to the right of the one you’re supposed to be rounding to. For example, to round the number 1,121,565 to ...

When you do not need to speak or write about exact quantities or measures, learning to round numbers to 10, 100 or 1,000 can be useful. It can make calculations easier and it also helps when you are ...

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 ...