Expressing any number to the power of a half is the same as giving the square root of the number. In this instance 41/2 = sqrt(4) = 2.
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Four minus one and a half is two and a half: 4 - 1.5 = 2.5
Two-fifths.Half of four is two, so half of four-fifths is two-fifths.
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Half of four miles is two miles.
I believe 'half four' is characteristic of British English. There are other ways to say this, eg 4.30 (said as as 'four-thirty').