Friday, January 31, 2014
When I think about the problems kids these days have with math, it can be summed up with "cross multiply."
When I teach this concept (with proportions)I stress that it is two fractions with an equal sign in the middle.
Somehow, the importance of that equal sign is never learned. If you have 2 fractions with a + in the middle - or a- or a *-doesn't matter. Two fractions means cross multiply.