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 ...

Scientific American presentsMath Dudeby Quick & Dirty Tips. Scientific American and Quick & Dirty Tips are both Macmillan companies. At some point in your life, you were most likely taught how to ...

Excerpted from "The Grapes of Math: How Life Reflects Numbers and Numbers Reflect Life." Numbers were invented to describe precise amounts: three teeth, seven days, twelve goats. When quantities are ...

Use place value cards to practice rounding numbers to the nearest ten and hundred. Warm up with a Mystery Math Mistake to hunt for the mistake made counting up on the number line. Use place value ...