We finally got to begin 2-digit by 2-digit multiplication this week! I began by reviewing with them the area model we used when multiplying by 1 digit. Then the kids self-discovered (with my prompting and questioning) that they could create an area model for 2x2 multiplication. They referred to it as the "double-decker couch." Ha! The
kids are absolutely loving the 2x2 area model!! They love it because it's super easy. I love is because
it shows them the place value involved in 2x2 multiplication. They can
actually see the process of multiplying the ones and tens of one number
by the ones and tens of the second number. When they finally move to
vertical multiplication, they'll actually understand why it works! There's nothing better than actually understanding
WHY you do something!!!
The area model can actually be formatted to fit more than 2x2 multiplication. We played around with differently-sized numbers and made our matrix box fit those problems as well.
|Our class anchor chart|
|Close-up of the box itself|