How do you put 1.349582 into 3 significant figures?
Round to 1.35. Non-zero digits are always significant. Refer to the rules for rounding significant figures in the explanation.
If the first number to be dropped is 4 or less, round down.
If the first number to be dropped is 6 or greater, round up.
If the first number to be dropped is 5, round so that the result will end with an even number.
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