Question

How many 2/3 pieces can you cut from a 10 foot long board

Answer 1

I told you in my answer that I was writing that you have to remember that in math any whole number converted to a fraction is over 1.  So make the 10 a 10/1. 

10/1 divided by 2/3 copy change flip.

10/1 x 3/2  multiple across 30/2  divide that answer is 15.  You can cut 15 boards that are 2/3 in length from a 10 foot long board.