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
Please type your __subject__ in the **School Subject** box. Any other words, __including obscure abbreviations__, are likely to delay responses from a teacher who knows that subject well.

- 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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