Ducky Havok Posted April 21, 2005 Share Posted April 21, 2005 Well my friends math teacher gave him this list of 50 math puzzles, and he passed it along to me (since he knows I like them more). Out of the 50 I haven't solved 7 (I just got them this morning and worked on them through school), so I figured I'd post them on here for you guys to try. If you really want I'll put up all 50 later. 1. Use three 5's to make 115 2. Use four 8's to make 100 3. Use two 4's to make 24 4. Use four 7's to make 70 5. Use three 4's to make 50 6. Use three of the same number to make 28 7. Use three of the same number to make 13 I think most have done these kind of things before, but just in case I'll give some examples. For instance, Use six 9's to make 100: [math]\frac{(999-99)}{9}=100[/math] The only rule is you are only allowed to use that one digit, but you can use any mathematical symbols you want (such as exponents or factorials, even decimal (like .5)) Have fun! Link to comment Share on other sites More sharing options...
RedAlert Posted April 21, 2005 Share Posted April 21, 2005 Does the exponent have to be of the same digit too? Link to comment Share on other sites More sharing options...
Ducky Havok Posted April 21, 2005 Author Share Posted April 21, 2005 Yes you are only allowed to use that one digit, like three 3's to make 729, [math]3^{3+3}=729[/math] Link to comment Share on other sites More sharing options...
RedAlert Posted April 21, 2005 Share Posted April 21, 2005 OK. I will try and work on them. Link to comment Share on other sites More sharing options...
dan19_83 Posted April 21, 2005 Share Posted April 21, 2005 1. 5! - [(sqr root 5) by (sqr root 5)] = 115 2. 88 divided by .88 = 100 3. (sqr root of 4 + sqr root of 4)! = 24 4. 77 - [(sqr root 7) by (sqr root 7)] = 70 5. 4! + 4! + square root of 4 = 50 6. 4! + [(sqr root 4) by (sqr root 4)] = 28 ! = factorial and sorry i can't use latex!! Link to comment Share on other sites More sharing options...
RedAlert Posted April 21, 2005 Share Posted April 21, 2005 Not allowed to use any numbers but 8. Anyways I got number 7(Use three numbers to make 13): 12 + (12/12) = 13 Link to comment Share on other sites More sharing options...
dan19_83 Posted April 21, 2005 Share Posted April 21, 2005 that's what i did Link to comment Share on other sites More sharing options...
dan19_83 Posted April 21, 2005 Share Posted April 21, 2005 Not allowed to use any numbers but 8. Anyways I got number 7(Use three numbers to make 13): 12 + (12/12) = 13 That may be wrong cause you are using the numbers 1 and 2. single digit numbers only??? i'm not sure Link to comment Share on other sites More sharing options...
RedAlert Posted April 21, 2005 Share Posted April 21, 2005 that's what i did sorry misread. #6. 9.333333333 + 9.333333333 + 9.333333333 = 50 Link to comment Share on other sites More sharing options...
RedAlert Posted April 21, 2005 Share Posted April 21, 2005 That may be wrong cause you are using the numbers 1 and 2. single digit numbers only??? i'm not sure You can use it any way. Link to comment Share on other sites More sharing options...
RedAlert Posted April 21, 2005 Share Posted April 21, 2005 2. 88 divided by .88 = 1005. 4! + 4! + square root of 4 = 50 A small math question, what does 4! mean? Link to comment Share on other sites More sharing options...
Ducky Havok Posted April 21, 2005 Author Share Posted April 21, 2005 on numbers 6 and 7 you are only allowed to use one number. Example, five numbers to make 100. 111-11=100. Good job on 2 and 5 dan19 83 Link to comment Share on other sites More sharing options...
dan19_83 Posted April 21, 2005 Share Posted April 21, 2005 4! means 4 factorial i.e. 4*3*2*1 = 24 Link to comment Share on other sites More sharing options...
Ducky Havok Posted April 21, 2005 Author Share Posted April 21, 2005 4! means 4 factorial, which is 4 times 3 times 2 times 1. Link to comment Share on other sites More sharing options...
dan19_83 Posted April 21, 2005 Share Posted April 21, 2005 keep an eye on post 5 by me. i'll edit it as i get more answers Link to comment Share on other sites More sharing options...
Ducky Havok Posted April 21, 2005 Author Share Posted April 21, 2005 dan, maybe you could use spoilers so others can try without accidently seeing it? Also, want the rest of them up? Link to comment Share on other sites More sharing options...
dan19_83 Posted April 21, 2005 Share Posted April 21, 2005 i'll try and learn how to do that in future, sorry. the last one is stumping me but that's because it's 4am here so i'm going to bed and i'll do it on the morning!!! put up the rest if others request cause i know it'll take you a lot of time to write them out and it would be a waste of time for just one person Link to comment Share on other sites More sharing options...
RedAlert Posted April 21, 2005 Share Posted April 21, 2005 12 + 12/12 = 13 is not right??!! I used only one number, 12..... Link to comment Share on other sites More sharing options...
Ducky Havok Posted April 21, 2005 Author Share Posted April 21, 2005 No, you used the numbers 1 and 2. You have to think single digits Link to comment Share on other sites More sharing options...
Martin Posted April 21, 2005 Share Posted April 21, 2005 1. 5! - [(sqr root 5) by (sqr root 5)] = 1152. 88 divided by .88 = 100 3. (sqr root of 4 + sqr root of 4)! = 24 4. 77 - [(sqr root 7) by (sqr root 7)] = 70 5. 4! + 4! + square root of 4 = 50 6. 4! + [(sqr root 4) by (sqr root 4)] = 28 ! = factorial and sorry i can't use latex!! Dan did a great job getting numbers 1 thru 6. May I try number 7? the question is how to use three copies of a number to make 13 [hide] 4! + sqrt 4 = 26' date=' so you can divide that by sqrt 4 and get 13 (4! + sqrt4)/sqrt 4 = 13[/hide'] these are nice puzzles D. Havok, hope you post more of this kind Link to comment Share on other sites More sharing options...
RedAlert Posted April 21, 2005 Share Posted April 21, 2005 Bah! The grapes are too sour anyways..... Link to comment Share on other sites More sharing options...
Dak Posted April 21, 2005 Share Posted April 21, 2005 OH FOR F*** SAKE! i only just realised that this is page 2, i thought that it was page 1 and that redalerts post was the op... you would not believe how long i spent trying to figure out in what dieviouse way a maths puzzle had been encrypted as 'the grapes are too sour anyways' dammit. Link to comment Share on other sites More sharing options...
dan19_83 Posted April 21, 2005 Share Posted April 21, 2005 OH FOR F*** SAKE! i only just realised that this is page 2' date=' i thought that it was page 1 and that redalerts post was the op... you would not believe how long i spent trying to figure out in what dieviouse way a maths puzzle had been encrypted as 'the grapes are too sour anyways' dammit. [/quote'] lol, i've been laughing my ass off for ages about this!!! Link to comment Share on other sites More sharing options...
RedAlert Posted April 22, 2005 Share Posted April 22, 2005 OH FOR F*** SAKE! i only just realised that this is page 2' date=' i thought that it was page 1 and that redalerts post was the op... you would not believe how long i spent trying to figure out in what dieviouse way a maths puzzle had been encrypted as 'the grapes are too sour anyways' dammit. [/quote'] HAHAHAHAHAHA! Link to comment Share on other sites More sharing options...
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