This strategy is called the Break Apart Method of multiplication. It is where we break a number apart using expanded form, multiply each part individually, then add up the products to find the overall total. While a little more lengthy than the traditional algorithm, which we'll be facing next, it helps build up an understanding of how the algorithm works. Understanding the meaning behind what we do is of the utmost importance so students can develop a deeper understanding of mathematical concepts.
Here is a video explaining the method:
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