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

asked Mar 9, 2021 178k views

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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
$21\cdot 36$ :

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

Dpedoneze answered Mar 14, 2021

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