Awesome Math Trick #1

Here is the first video from my new, extra channel! Please subscribe if you haven't already.

Hope you enjoy this quick, quirky math trick! Try it on your friends and amaze them!

[kets]

I LOVE YOUR CHANNEL keep up the amazing work!!

[BronzeSpaceComet]

This is SO COOL! Thanks Thomas8april! Great first vid!

[preonacraig]

I pick different numbers every time and u always get it right

[mihajloantic]

Face cam or just voice!!!! Only 1 video!!More!!!!You are good Youtuber!!

[Pigmist]

whenever some ask u one of these questions make sure u use a decimal number

[marygalvez]

Wow that's right, how do you do that please answer!!!!

[mineplexwarrior]

Here is how it works...
1. 1+7=8
a. 20-8=12
b. 12+1=12
2. 2+7=9
a. 20-9=11
b. 11+2=13
...you get the rest

[whateverguy]

Wow you got it my first number was 10

[samarmohamedali]

I've tried all the numbers from 1-10 and they all gave me 13!!!! If it didn't work... Try again !!

[tutisuni]

How the hell did you figure out my number, I chose 7 and then you chose 7 as well

[joeltaylor]

21? I started with 2 first it became nine. I thought that it was going to be ten and BAM 21! I am so lucky I didn't get 13