Posted by damien on Wednesday, November 10, 2010 at 6:06am.
The sum of my ones digit and tens digit is 10. My tens digit is les than my ones digit and both my digits are prime. i am a prime number. what number am i?

Math riddle  Writeacher, Wednesday, November 10, 2010 at 7:07am
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2nd grade  Dr Russ, Wednesday, November 10, 2010 at 7:10am
Lets say the number is AB
so A+B=10
we also know that A<B
and both A and B are prime
so possibilities for A and B are
1,2,3,5,7
if A<B then A can only be 1,2,3,or 5
the only pairs such that A+B=10
are 55, 37
of these two only 37 is a prime number
But check the logic!

2nd grade  Anonymous, Wednesday, November 24, 2010 at 7:33am
1

2nd grade  gummy bear, Wednesday, November 28, 2012 at 4:55pm
gummy bear yaaaaa
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