For example, when performing the operation 128.1 + 1.72 + 0.457, the value with the least number of decimal places ( 1) is 128.1. There are additional rules regarding the operations - addition, subtraction, multiplication, and division.įor addition and subtraction operations, the result should have no more decimal places than the number in the operation with the least precision. For example, if the sample size is 150, the log of 150 is approximately 2.18, so we use 2 significant figures. When dealing with estimation, the number of significant digits should be no more than the log base 10 of the sample size and rounding to the nearest integer. For a very small number such as 6.674 x 10⁻¹¹ the E notation representation is 6.674E-11 (or 6.674e-11). To enter scientific notation into the sig fig calculator, use E notation, which replaces x 10 with either a lower or upper case letter 'e'. What if a number is in scientific notation? In such cases the same rules apply. We simply round the entire number to the nearest thousand, giving us 3,454,000. Suppose we want 3,453,528 to 4 significant figures. Now we'll consider an example that is not a decimal. Next, we round 4562 to 2 digits, leaving us with 0.0046.
The trailing zeros are placeholders, so we do not count them. Suppose we have the number 0.004562 and want 2 significant figures. Our significant figures calculator works in two modes - it performs arithmetic operations on multiple numbers (for example, 4.18 / 2.33) or simply rounds a number to your desired number of sig figs.įollowing the rules noted above, we can calculate sig figs by hand or by using the significant figures counter.
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