3 years ago

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

1 answer:

8 0

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

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

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