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What is another strategy that you can use to multiply 2 digit by 2 digit numbers?

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You may write them separating the units and tens digits, and then use FOIL to add 4 easy tems. For example, let's compute
21\cdot 36:


21\cdot 36=(20+1)(30+6)=600+120+30+6 = 756

User Dpedoneze
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