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Anonymous
I would do it as follows:305 * 144 = (300*144) + (5*144) = 100*(3*144) + 10*(144/2) [because 5 = 10/2]= 100*(432) + 10*72 = 43200 + 720 = 43920.
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305 x 144 = 43920
Exactly 144 times
144 / 2 = 72
144 x 144 = 20736
144 is 2 times 2 times 2 times 2 times 3 times 3.
12 times 5 is 60