math
posted by Todd on .
23x17 in expanded algorithm

23
x17

21 = 3x7
140 = 20x7
3 = 3x1
20 = 20x1

184
Now, I had never heard of this method. I did a google and found lots of examples. Seems like you could have made a similar effort before asking someone else to solve your problem. 
oops. and I got it wrong, too. Can you fix it?