Easy way to do 12 multiplications

by remembering 3 easy ranges (shown in the video), you can do the most common 12 X multiplication problems in your head in seconds. The video goes over larger numbers than expected of most elementary and Jr high kids, but it is to illiterate a pattern and how easy it is to apply it.

Видео Easy way to do 12 multiplications канала oscarkarem - Things I've learned