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The answer kind of depends on what "this problem" is!

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The least number of significant figures in any number of the problem determines the number of significant figures in the answer.

The least number of significant figures in any number of the problem determines the number of significant figures in the answer.

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The least number of significant figures in any number of the problem determines the number of significant figures in the answer.

If the conversion factor is exact, then the number of significant figures in the answer is the same as the number of significant figures in the original number.If the conversion factor is an approximation, then the number of significant figures in the result is the lesser of this number and the number of significant figures in the original number.

When multiplying, the number of significant numbers in the answer should be the same as the fewest significant figures in the problem. Both 13.5 and 3.00 have three significant figures, so the answer will have three significant figures. 13.5 x 3.00 = 40.5 exactly (no need to round).

2. The least number of significant figures in any number of the problem determines the number of significant figures in the answer.