Sunday, November 30, 2008

Invert and multiply...which one????

Oh, just flip it upside down and then multiply (“invert and multiply”).
But they are not sure which one to flip!!

Students learn this in late elementary, but when asked “Why?”,
they will say “Oh, it’s the rule”.

An example such as “How much is 12 divided by ½?” can illustrate the concept and learners can follow this example rather than a rule!!

How many half dollars are in $12?
How many half inches in 1 foot?

12 x 2/1 = 24!! ;)

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