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When working with whole numbers, pay attention to the last significant digit that is to the left of the decimal point, and round your answer to that same point. For example, consider the subtraction: \(78,500 \: \text{m} - 362 \: \text{m}\). The calculated result is \(78,138 \: \text{m}\).
- Significant Figures in Calculations
When performing mathematical operations, there are two rules...
- 4.6: Significant Figures and Rounding
Addition and Subtraction. In operations involving...
- Significant Figures in Calculations
When performing mathematical operations, there are two rules for limiting the number of significant figures in an answer—one rule is for addition and subtraction, and one rule is for multiplication and division.
Addition and Subtraction. In operations involving significant figures, the answer is reported in such a way that it reflects the reliability of the least precise operation. An answer is no more precise that the least precise number used to get the answer.
31 lip 2010 · Add and Subtract with Significant Figures (1.6) To see all my Chemistry videos, check out http://socratic.org/chemistry How to do addition and subtraction with...
1 wrz 2014 · To use your example, when calculating the subtraction part: 2.378-1.2 = 1.178, in approach 1, by 'rounding' this down to 2 significant digits (1.2), you are reducing the accuracy of your calculation before you finish.
This principle can be translated into a simple rule for addition and subtraction: When measurements are added or subtracted, the answer can contain no more decimal places than the least accurate measurement.
The subtraction of (73 – 32) yields 41, which contains 2 significant figures. Remember, for addition or subtraction, report to the same number of decimal places as the term with the least amount of decimal places (see rule 5). In this case, it the “ones” place.
