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It depends on the context.
In the case of logarithms, the number is usually given as a CHARACTERISTIC and a MANTISSA. The mantissa is always positive and comes after the decimal point (or its equivalent). However, the characteristic, which coes before the decimal point may be negative. If it is negative, it is written with a bar on top.
Whereas with ordinary numbers "minus two and a quarter" is written as -2.25, with logariths, it is interpreted as -3 plus 0.75 and written as 3bar.75 where bar represents the horizontal line above the number. Sorry, but this browser does not allow me to show it properly.
One reason for this seemingly strange procedure is that if you are dealing with logarithms to the base 10, then the power of 10 in the antilog is the same as the characteristic.
Thus antilog(0.301) = 2 = 2*100
antilog(1bar.301) = 2*10-1
antilog(3bar.301) = 2*10-3
To those not familiar with the term, antilog10(x) = 10x
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