How to find 10 and 20% of any number

All right, tipping. 10 and 20% how to do it quickly. All right, so let's say our bill is 17 76, right? We just got to move this here. Since this is higher than a five, I'm just going to turn this into an eight. So, we have a dollar and 78 and that equals your 10 Holy jeez, your 10% of 1776 is a dollar 78, all right? Give or take a penny. You mean you could bump that down and make it less, but besides the point, all right? Let's do 20%. So, all you got to do is times it by two. That gives you 20%. So, let's break this down. So, you got a dollar 50 times two gives you $3, right? We can break this down. We can break it down to 28 times two which equals 56. Or, if you want to break it down even more, you could do 25 times two equals 50. You have three left over. Three times two equals six. Add them all together and you got $3 and 56 cents equals 20 percent of 1776, all right? Now, what if we want to keep this easier because little change doesn't matter, help somebody out, it is what it is. So, you can take the 1776, round this whole bad boy up to 18. Move your decimal in and you got a dollar 80 which is 10% okay? Times that by two. All my skateboard guys up there, snowboard, ski guys, whatever. You guys all know that times two on 180 gives you $3 60 cents and that is 20%. Follow for more.