(can use the same idea to show multiple ways of adding/subtracting) GREAT!-- multiplication unit to teach repeated addition, groups of, commutative property, and arrays. You could also replace one with a multiplication word problem and picture.
"The most powerful tool in coaching is the question - the Greek philosopher Socrates is regarded by some to have been the first coach. Among other things, he used deversified questions in his talks with his students. Here is how he did it.