1/2
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0.5
It is: 1/2-4 = -3.5
6 and one half minus 4 = 2 and one half 6 1/2 - 4 = 2 1/2
You can say "10 raised to minus 4 metres" or "10 to the power minus 4 metres".Also, 10-4 = 0.0001 m = 0.1 mmSo, you would also be right by saying "point 1 millimeters", "zero point one millimeters" or "point 1 mm".
1/4 minus 1/2 is -1/4.