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10 with an exponent of -6 = 4
You evaluate the powers of 10 and a exponent of positive 4.
The mantissa is multiplied by 10 raised to the power as shown by the exponent. So, if the exponent is 4, then you multiply the mantissa by 10^4 = 10,000. If the exponent is -4 then you multiply the mantissa by 10^(-4) = 0.0001 or, equivalently, divide by 10^4.
For 104 the base is 10 and the exponent is 4.
It is 2.5/(10*10*10*10) or 2.5*0.0001