How about some mental math? Some of you may or not know, I have always been interested in mental math and mental calculators. I've even trained substantially for some mental math competitions (doesn't mean I'm any good though, haha!). Here is an easy beginner mental math trick that looks super impressive: how to calculate the cube root of a 2-digit perfect cubed number!
It works like this: ask a friend to choose a 2-digit number, cube it, have them tell you the large answer, and you can figure out the original 2-digit number. Cool!
Here's how to do it: