rookie1ja Posted March 30, 2007 Report Share Posted March 30, 2007 100 - Back to the Number Puzzles Using four sevens (7) and a one (1) create the number 100. Except the five numerals you can use the usual mathematical operations (+, -, x, , root and brackets (). This old topic is locked since it was answered many times. You can check solution in the Spoiler below. Pls visit New Puzzles section to see always fresh brain teasers. 100 - solution 100 = 177-77 = (7+7)x(7+(1:7)) I do not know other solutions. Link to comment Share on other sites More sharing options...
Guest Posted June 1, 2007 Report Share Posted June 1, 2007 Another solution would be take 7-7=0 7-7=0 and put the one in front of it which would be100 Link to comment Share on other sites More sharing options...
Guest Posted June 5, 2007 Report Share Posted June 5, 2007 concatenation isn't a mathematical operator > Link to comment Share on other sites More sharing options...
Guest Posted June 8, 2007 Report Share Posted June 8, 2007 How about this? 77+(7+7+7)+(7/7)+1 100=77+23 =77+(21)+(2) =77+(7+7+7)+(1+1) =77+(7+7+7)+((7/7)+1) Link to comment Share on other sites More sharing options...
Guest Posted June 8, 2007 Report Share Posted June 8, 2007 You're only allowed 4 sevens...not 7 sevens... Link to comment Share on other sites More sharing options...
Guest Posted June 21, 2007 Report Share Posted June 21, 2007 uhh its just 7^2+7^2+1+1 Link to comment Share on other sites More sharing options...
Guest Posted June 21, 2007 Report Share Posted June 21, 2007 uhh its just 7^2+7^2+1+1 That's two 7's, two 2's, and two 1's...not four 7's and one 1. Link to comment Share on other sites More sharing options...
Guest Posted June 24, 2007 Report Share Posted June 24, 2007 it is 4 sevens just not 1 one. (7x7)=7^2. Link to comment Share on other sites More sharing options...
Guest Posted June 26, 2007 Report Share Posted June 26, 2007 7 x (7+7) + cubed root of (7+1) = 100 7 X 14 + cubed root of 8 98 + 2 = 100 Link to comment Share on other sites More sharing options...
Guest Posted June 28, 2007 Report Share Posted June 28, 2007 Hi all, I thought of a unique solution... By inverting 2 of the 4 - 7's 1 L7 L7 Ha Ha ! ! Link to comment Share on other sites More sharing options...
Guest Posted July 5, 2007 Report Share Posted July 5, 2007 Editted - i found the flaw in my answer, nevermind... Link to comment Share on other sites More sharing options...
Guest Posted July 11, 2007 Report Share Posted July 11, 2007 How about.. (7 + 1/7) (7+7) Link to comment Share on other sites More sharing options...
Guest Posted July 11, 2007 Report Share Posted July 11, 2007 Clever! I've done a challenge a bit like this: create all numbers from 1-200 using 4 4s and the following mathematical operators: +, -, /, x, ! (factorial), !! (double factorial), INT, MOD, SQRT, ^ (power). You can't do squares etc. - if you use powers the number has to be raised to its fourth power (or 4x4th power etc.). It is much harder than it looks like! Link to comment Share on other sites More sharing options...
Guest Posted July 11, 2007 Report Share Posted July 11, 2007 How about.. (7 + 1/7) (7+7) SWEET!! Link to comment Share on other sites More sharing options...
Guest Posted July 13, 2007 Report Share Posted July 13, 2007 At least Daniel had a very clever answer! Link to comment Share on other sites More sharing options...
Guest Posted July 14, 2007 Report Share Posted July 14, 2007 Are you being sarcastic? It was mannu who posted that answer. Link to comment Share on other sites More sharing options...
Guest Posted July 25, 2007 Report Share Posted July 25, 2007 ERROR Link to comment Share on other sites More sharing options...
Guest Posted July 26, 2007 Report Share Posted July 26, 2007 What do you mean "error"? Are zou spamming? Link to comment Share on other sites More sharing options...
Guest Posted August 23, 2007 Report Share Posted August 23, 2007 (7*7)+7+7+1 = 100 BTW, it's octal Link to comment Share on other sites More sharing options...
Guest Posted September 4, 2007 Report Share Posted September 4, 2007 (7*7)+(7*7)+1=100 Link to comment Share on other sites More sharing options...
Guest Posted September 15, 2007 Report Share Posted September 15, 2007 How about ... (7*7+1) (7+7)/7 = 100 Link to comment Share on other sites More sharing options...
Guest Posted September 21, 2007 Report Share Posted September 21, 2007 (7*7)+(7*7)+1=100 Um...that's only 99 not 100. Link to comment Share on other sites More sharing options...
Guest Posted October 10, 2007 Report Share Posted October 10, 2007 How about ... (7*7+1) (7+7)/7 = 100 nice, but only four 7s are allowed Link to comment Share on other sites More sharing options...
Guest Posted October 23, 2007 Report Share Posted October 23, 2007 100 - Back to the Number Puzzles Using four sevens (7) and a one (1) create the number 100. Except the five numerals you can use the usual mathematical operations +, -, x, :, root and brackets (). The language should be changed in the problem. Drop the word "EXCEPT" and replace it with the phrase "In addition to". -Brett Link to comment Share on other sites More sharing options...
rookie1ja Posted October 23, 2007 Author Report Share Posted October 23, 2007 100 - Back to the Number Puzzles Using four sevens (7) and a one (1) create the number 100. Except the five numerals you can use the usual mathematical operations +, -, x, :, root and brackets (). The language should be changed in the problem. Drop the word "EXCEPT" and replace it with the phrase "In addition to". -Brett thanks, I have edited the puzzle ... feel free to check the wording in other puzzles as well Link to comment Share on other sites More sharing options...
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