1.25 - 0.50 = 0.75 ■
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5 - 2.5 = 2.5
two and one half
One quarter is two eighths, so five eighths subtract two eighths is three eighths.
There are two fives. The first is worth five units. The one after the decimal point is worth five tenths, or a half.
0.5 is one half, therefore, as a fraction, it is one over two - 1/2.