Our current unit of study extends multiplication into double-digits (like 23 x 234) by using arrays to visualize the math problems and solutions.
Why use arrays? Arrays (or area models) ask students to use the commutative property and the distributive property as they solve multiplication problems. That means they are practicing algebraic thinking skills that they will need to be successful in middle school math and beyond.
Here's an example of what this looks like:
Students will also learn the standard US algorithm for double-digit multiplication on paper, but this taught as a reliable back-up way of checking their work... much like they would use an electronic calculator.
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