Sometimes the easiest, simplest way to liven up a party, sleepover, family gathering or presentation to a class is to perform a magic trick. Most magic tricks require fancy costumes and props, but ...
What are you like at multiplications? Chances are if you're a mere mortal 2, 5s and 10s won't seem too taxing. But when it comes to figuring out what 42x21 is, you may wish somebody had shown you the ...
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