7 and 1/2 = 15/2 = 75/10
2 and 4/5 = 14/5 = 28/10
75/10 - 28/10 = 47/10 or 4 and 7/10
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four fifths
Four-tenths, or two-fifths.
4/5 = 8/10 = 0.8 0.8 - 0.3 = 0.5 one half
Two and four fifths rounded to the nearest half is three (3).
One half and four fifths can't be written as improper fractions.