We’ve spent a lot of time on addition and subtraction in part because I wanted to insure that The Tornado had a good grasp of her fact families. I used to feel pressure to keep up with others who were also using Singapore Math, but I’ve become less concerned with the speed in which we complete things and more with the level of mastery we achieve. We just began multiplication in Singapore Math book 1b and The Tornado mastered the concepts pretty quickly. We decided to put together two instructional videos that help introduce multiplication.
In the first video, I explain the concept of grouping in multiplication. It is simple and basic.
In the second video, The Tornado explains the relationship between grouping, addition, and multiplication. There are are few errors in the second video and we will redo it to fix them, but I did want to share our first attempts.