Two-digit multiplication (4th grade) and why we add a zero on the 2nd line
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YouTubeMath Mammoth
Two-digit multiplication (4th grade) and why we add a zero on the 2nd line
I explain how to multiply by a two-digit number (standard multiplication algorithm). This involves two separate multiplications and lastly adding their results. In the second multiplication, one has to add a zero in the ones place. This is because we're actually multiplying by a multiple of ten (such as 70 or 40). (I explain that more in this ...
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