You do nothing: 0.42 is a decimal fraction!
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21/50
Forty-two thousandths
762+80=842
Sixteen million, four hundred twenty-one thousand, forty-two.
LXW is the formula for area so it's 12X20=?? Grab that cell phone theres a calc function in there Then its 12X12 tiles = 1 sq ft each so looks a lot like your answer should resemble 042 in the mirror