What is 456 to 2 significant figures?

What is 456, 2.345 and 77.09 to 2 significant figures for each one?
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Two significant figures implies non-zero figures. 456 is 460, because 456 is nearer to 460 than 450, and 4 and 6 are the significant figures. 2.345 is 2.3 to two significant figures because 2.345 is nearer to 2.3 than 2.4. 77.09 is 77 to two significant figures.

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