Norm wrote; > >What, IMHO, are some of the "basic" facts of multiplication? > > Multiplication is commutative. > Multiplication is associative. > 1 is the multiplicative identity. > 0 is the multiplicative "annihilator." > Multiplying x by -1 yields -x. > Given x > 0: > if n > 1, then n * x > x > if 0 < n < 1, then n * x < x (an example where multiplication "makes >things smaller") > Additionally, students should be able to represent multiplication through >various models (area, arrays, etc.)
I would like to add that a "basic fact" of multiplication is when to use it and why.
When I asked the question what "basic facts" and who decided they were basic, I was referring to exactly what Norm has discussed.