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my dad's math trick was very basic. if you add two numbers, and notice if they're odd or even, you can predict the outcome's oddness or evenness. This is amazing to a little kid. so, to prove it:
if you add two even numbers, you get an even answer.
ex. 2+2=4, 2+4=6, 60+18=78, etc.
if you add two odd numbers, you also get an even answer.
ex. 1+3=4, 17+3=20, 21+201=222, etc.
on the other hand, if you add and odd and even number, you get an odd answer.
ex. 1+2=3, 21+6=27, 15+3=18, etc.
if you tell this one to a little kid, of the right age, they will then spend the next however long trying to prove it wrong.
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