How to Use Logarithmic Tables Method 1 Quick Instructions: Finding a Logarithm 1 Choose the correct table. To find log a (n), you'll need a log a table. Most log tables are for base-10 logarithms, called "common logs." [2] Example: log 10 (31.62) requires a base-10 table. 2 Find the correct cell. Look for the cell value at the following intersections, ignoring all decimal places: [3] Row labeled with first two digits of n Column header with third digit of n Example: log 10 (31.62) → row 31, column 6 → cell value 0.4997. 3 Use smaller chart for precise numbers. Some tables have a smaller set of columns on the right side of the chart. Use these to adjust answer if n has four or more significant digits: Stay in same row Find small column header with fourth digit of n Add this to previous value Example: log 10 (31.62) → row 31, small column 2 → cell value 2 → 4997 + 2 = 4999. 4 Prefix a decimal point. The log table only tell...
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