HYPATIA:When multiplying fractions by integers, by whole numbers, things are slightly ... Using addition and subtraction in multi-step problems. videoUsing addition and subtraction in multi ...

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 ...