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One of the key functions that Microsoft left out of Microsoft Excel is one that returns values to the number of significant digits that you wish to use. The Significant Digit Assistant adds this function to Excel! It also contains features that help you add this function to many cells very easily. The following picture illustrates the Significant Digit Assistant dialog that helps you modify a large group of cells:
The Significant Digit Assistant uses the following rounding rules:
Rule 1: If the digit to be dropped is less than 5, drop that digit
and all other to the right of that digit.
Rule 2: If the digit to be dropped is greater than or equal to 5,
increase the value of the last digit retained by one.
Rule 3: If the digits to be dropped are to the left of the decimal
point,
zeros are used as their replacements Rule 4: If the digit to be dropped is 5 and is followed by zeros, drop the 5 and
(i) keep the last digit as is if the digit before the '5' is even
Example 1: 47.250 rounded to 3 significant digits is 47.2 Please note that although all calculations for rounding are done using double precision, calculations are digital and subject to the values being supplied to the significant digit function and calculated by it to suffer from digital impression. For example a value that you see in a cell may be visually 0.5. There is a slight chance that Excel may be carrying this value as 0.500000000001 or 0.4999999999. In which case when the Significant Digit Assistant treats this a number not equal to 0.5 and follows rules 1 and 2 for rounding.
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