Building on that short foundation:
Remember, I am condensing hours and hours into less than 20 minutes. If you miss something or you don't "get it" watch them a couple times...
Two vids on Cross Multiplication. More explanation with words and maybe some pictures coming your way soon. Meantime go to Crewton Ramones's House of Math for more.
Also if you think this is cool, wait till you see the vids I make on algebra: problems like (x+1)(x+2) = x2+2x+2, I use exactly the same blocks.
More beginner multiplication at CRHOM.