NARRATION:Back in the deepest, darkest depths of time, there lived a great mathemagician called Hypatia. Numbers fell under her spell one by one. With them, Hypatia could do anything. Now Hypatia is ...

Republicans faced mockery in the last few years for inventing their own words. Rep. Paul Ryan did them one better. He invented his own math. An hour after its birth, his budget was hailed as a ...

Here you will find a video about addition and subtraction. Watch this, and then test your knowledge with a short quiz before exploring the rest of the collection. This section contains videos from our ...