573 x 645 = 369,585
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645 X 73 use LONG MULTIPLICATION. 645 x 73 45150 ( 70 X 645) ( multiply by '7' and then put as '0' on the end). +1935 ( 3 x 645) 47058 ===== The answer.
573 = (5 x 102) + (7 x 101) + (3 x 100)
4515 x
645129 x 543 x 5 x 3
About 134 x 208 feet.