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January 14th, 2014, 03:45 PM  #1 
Member Joined: Dec 2013 Posts: 31 Thanks: 0  A question that sounds like a middle school one
Among the one hundred numbers 1^2, 2^2, 3^2, ..., 99^2, 100^2, how many of them have an odd number as the tens digit? The answer sheet says to try, but I don't like that 
January 14th, 2014, 04:11 PM  #2  
Member Joined: Dec 2013 Posts: 82 Thanks: 0  Re: A question that sounds like a middle school one Quote:
The pattern seems to be, if the number ends in 4 or 6 then it will be odd, otherwise it is even, except for squares of 1, 2, and 3 whose squares are less than 10.  
January 18th, 2014, 04:18 PM  #3 
Member Joined: Dec 2013 Posts: 31 Thanks: 0  Re: A question that sounds like a middle school one
Thanks, problem solved.


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