Posts tagged simpsons
How To Multiply By Seven on Your Fing...
When I tutored elementary school math, one of my favorite things to show the kids was how to multiply by 9 using their fingers. (I apologize, but this trick assumes that you have five fingers on each hand. Later you’ll see how to adapt it if you have nonstandard hands.)
Here’s how the finger rule works. Let’s say you want to [...]
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