
Re: Simplifying Algebraic Expressions with Subtracted Expressions
Posted:
Nov 15, 2013 2:42 PM


R Hansen says: >What she did was reverse engineer the solution *she* already knew.
She reverse engineered it from the number 400? I doubt it. I wasn't there, but I think a more likely guess is that the hypothetical kid *knew* the process, the steps, of how to get an answer this way.
Cheers, Joe N

