Mind-Reading Math Illusions
Impress your audience with the "End With 3" trick. This trick is a good one to start with, as its one of the simplest. So what are you waiting for? Follow these steps to blow your friend's mind (and pro tip: it might help to give them a piece of paper if mental math might not be their strength). Ask an audience member to choose a number between 1 and 10. Tell your audience to multiply their number by 2. Ask the audience to multiply the new number by 5. Have the audience divide their current number by their original number. Instruct the audience to subtract 7 from their current number. Now it's your turn. If they did everything correctly, the answer will always be 3. Amazing! For example: if they choose 3, they'll do 3x2=6, 6x5=30, 30/3=10, and 10-7=3.
Perform the "Divide by Half" trick. This one's a little more complicated, but it's a perfect way to ramp up the excitement for your audience. This time, you'll have to choose a number too, specifically, an even number. Follow these steps: Ask your audience to choose a number between 1 and 10. Tell them to multiply their chosen number by 2. Choose an even number to use yourself and share it with your audience. Ask them to add your number to the one in their head. Tell your audience to divide the new number by 2. Tell them to subtract their original number from the equation. Next, blow their mind. The answer is half of the even number you chose initially. For example: if you choose 10, and your audience member chooses 3, the equations will be 3x2=6, 6+10=16, 16/2=8, 8-3=5, and finally, 5 is half of 10.
Wow your friend with the "Lucky Number 13" trick. This great trick operates on the unique property of the multiples of 9. Here's how you'll impress your friend with simple math: Ask your audience to choose a number between 1 and 10. Tell them to multiply their number by 9. Ask them to add the first and second digit of their new number together. If it's a single digit number (i.e. 9), add 0. Get them to add 4 to their new number. Now, shock them with the final result! Their number should be 13. For example: If they choose 3, the equations will be 3x9=27, 2+7=9, and 9+4=13.
Add some panache to your performance. While the most important thing is that you get the steps down right, you're ultimately performing a magic trick. Showmanship and style give your performance extra excitement, pizzaz! Try to speak in a confident, theatrical voice, lean into big hand gestures, and when you're done, refuse to share the magic behind your tricks.
Simple Number Tricks
Blow friends' minds with the power of simple math. Math is filled with balance, patterns, and other awesome features. The tricks we walked you through above rely on those very patterns, but not all tricks have to be about mind-reading. If you can't get someone to pay attention for a full trick (or you don't feel like memorizing the schtick), then share some quick, magical mathematical moments instead. Multiply 6 by an even number. The answer will end in the number you multiplied by (6x4=24, 6x8=48). Repeat any number 3 times in your head (i.e., 777, 111, 444). Add up the digits, and divide your original number by the result of your addition. Your answer is 37! Start with a number between 1-6. Multiply by 9, then 111, then 1001, and then divide by 7. The result will astound friends: it'll always contain a 1, 2, 4, 5, 7, and 8.
Surprise your friend with funny, numbers-based riddles. There are tons to try, and we've listed some of the best below. Though these don't involve math (or mind reading), they do create a funny gotcha moment that'll leave your friend feeling silly. How many 9s are in 100? Your friend might feel tempted to say "10," but in fact, the answer is 20. How many letters are in the alphabet? "The alphabet" has 11 letters. Your two coins equal 30 cents, and one of them isn't a quarter. Which coins do you have? A nickel and a quarter (the nickel is the coin that's not a quarter). There are eight oranges in a bag and you take away two. How many do you have? 2 of course! Specifically, the 2 that you took away. Some months have 8 letters in their name, some have 5. How many have 3? All of them have (at least) 3, duh!
Show off with the first 7 letters of Pi. I know what you're thinking: yeah, I would if I could! But the truth is, you don't have to memorize those 7 numbers, you just have to recall a single sentence (How I wish I could calculate Pi). Say it to yourself a few times to burn it into your brain, and then, count the number of letters in each word. "How" = 3, "I" = 1, "wish" = 4, "I" = 1, "could" = 5, "calculate" = 9, "Pi" = 2. What do you end up with? 3.141592, or, the first 7 numbers of Pi.
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