By 10, by 9, by 5, by 3, and by chunks. This unit contains tricks for multiplication and for checking your work. A playful (and very useful) approach to multiplication. This unit is presented at three levels of varying complexity.
Including an introduction to the history of algorithms as well as their more common contemporary uses, this mini-unit features short, easy problems and a few longer ones to help students understand the importance of algorithms in problem-solving.