Zero limits 3 the final chapter10/25/2023 If the number immediately to the right of the last significant digit is less than 5, it is dropped and the value of the last significant digit remains the same. Once you know that, round to that many digits, starting from the left. To round a number, first decide how many significant figures the number should have. Before dealing with the specifics of the rules for determining the significant figures in a calculated result, we need to be able to round numbers correctly.
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