Haba, as per rule, the product should have two significant figures, since 2.0 has two. So, 2.0 multiplied by 3.145 is 6.29, but you report it as 6.3. But I say, who counts figures at 2am? My physics practical marks depend on this mobile data finally working so I can submit the online worksheet before this weak signal fades again with the rain.
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