字幕列表 影片播放 列印英文字幕 okay i'm gonna go ahead and start uh... today's workshop is called memory tricks and the reason that next week's workshop is called more memory tricks is because i know a lot of tricks and i can't get them all in one workshop so more of the same next week if you find today's workshop helpful which i hope you do and you're able to come back next week that would be great 'cause that way you get sort of the full teaching on this if you're not able to make it next week and this is the only one you come to hopefully you'll still get something good my first thing that i'm gonna do with you today is to show you hopefully the power of that word the word tricks i gave a workshop last week called how to remember for tests so that was the first memory workshop but for this one what i want you to try to uh... understand and sort of value is the fact that if you learn tricks or shortcut ways to do things it makes it so much easier to memorize lots of things for school and it makes your memory look even better than it is now and i'm hoping it's pretty good to very good but it makes it look even better and so most of you have probably seen magic tricks performed before uh... either in person or on t_v_ and if somebody is a good magician and they do uh... trick and you watch carefully and try to figure out how they move the elephant from there to there or cut someone in half and put them back together if they're good you can't figure out how they did it and your mouth drops open wow but if you find out how they do the trick and you realize ah it's just a cute little trick and then you see the magic trick again it's not so special anymore because the magic is gone well i want to show you two things to start with and i'm actually gonna do this next week too this is like your mental warm up before i get to the main teaching uh... i don't know what your attitude is toward math some people love math some people okay and some people hate math with a passion i ran into a former student today and i said how are your classes going this semester she said fine except math and that's how she says math and so if that's you you're gonna learn something here if you like math great a few of you might have seen this before but again it's not to teach you math as much as it is to show you the power of tricks ok so i'm just going take a few minutes with this and then we'll move into the main a section of the workshop okay if i ask you to do this problem which i don't want you to do actually but if i asked you to do this on paper this is thirty five times what thirty-five now even if math is your weakest subject if you wrote down that problem and you did the problem i think everyone here could come up with the right answer you know it's not that difficult but if i told you that you could actually do this kind of problem in two or three seconds in your head most people even if they're not great at math would think uh... boy you don't know my mind i can't do something like that but if you know the trick it's easy ok so here's how it works when you have a two-digit number that ends in five and you want to square it or multiply it by itself all you have to do is one simple thing and that is look at the first number which in this case is three multiply it by one more than that so this is tough math what's one more than three what's three times four twelve that's pretty easy right well twelve and then you do one more thing and that is stick the number twenty five on the end and then you're done that's it one thousand two hundred and twenty-five is the answer people when i show them that they say wait a minute but how did you and you know what i always say who cares as long as it works you don't even have to know why it works it just does so if i give you sixty-five squared you're supposed to be able to know how to do that quickly unless i've lost you over here which is ok it's six times seven which is forty-two and then twenty five okay and that's it when i show this to people also and they learn how to do it and they think wow that's fast you know that's good one thing that they ask is does this work with all numbers and my answer to that is no if it worked with all numbers we would all be math majors right 'cause this is really easy but there are a lot of other math tricks a lot of them and i'm gonna show you one more in a minute but here's what i wanted to to tell you um... i have actually had students try this before and whether you do this or not is up to you but it's kind of fun to experiment with it or try it and that's this um... once somebody learns how to do this even if they don't understand why it works but they just know the two little steps very often i've had students go up later today to someone they know family member friend classmates somebody and they walk up and they hand them a piece of paper and a pen or pencil and they say this and if you do this this is what i want you to say i want you to choose a number that is two digits and ends in five and you square it on paper and i'll do it in my head and we'll see who finishes faster so in other words trying to show off your great math ability okay so the person looks at you and i've had people even do this with family members who knew they were bad at math and this really blows the mind of somebody like that so they say okay two-digit number that ends in five they say yeah okay how about twenty five and so they write the problem the way that it normally is written by the time they finish writing the problem you should already know the answer and they haven't even started figuring it out yet what's the answer to that yeah six twenty five 'cause it's two times three is six twenty five so what you do to impress them is before they've even done anything you tell them the answer but you don't say it like this six twenty five you have to have an attitude about it you see it this way six twenty five like come on give me something tough and they're going to look at you and they're going to think get out of here and then they're gonna start going through and doing the problem the normal way and then at the end they get the same answer that you got and they're going to look at you i guarantee you and they're going to say how'd you do that so fast if they ask you this is the only time i'm ever going to say this ever lie don't tell 'em say this this is my favorite things say this i can't tell you how i do the problem like that so quickly but i've been lying in bed till two o'clock in the morning everynight learning to move the numbers in my mind and they'll look at you and go wow... and they'll say wish i could be as good as you are and then here's the hardest part you have a straight face no smiling or what ever you look at 'em and say well you keep working on it and maybe one day you'll be as brilliant as i am and that's hard for you to say because you know that it's just a simple trick but what they think when you're able to come up with something that fast is that you're basically doing this and you're doing all these things and you're not doing any of that well it's kinda nice to be able to do something like this and impress somebody ok now if they ask you a day or two or three later if you see him again and they say can't you tell me how you do those problems so fast i'm still thinking about that go ahead and say all right i'll tell and then show them this and watch their great admiration of you just drop and they'll just look at you like they thought you were special because it's not special but if you don't know how to do it it looks fantastic okay so that's the idea with tricks and then i'm gonna to show you one other