The denominators have to be equal, so multiply the numerator and denominator of the first number by two. This will give you 8/10 - 1/10. Then you just subtract the numerators. So 8/10 - 1/10 = 7/10, or 0.7.
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1 tenth
Twenty four fifths is four and four fifths. So if you take three away, that leaves one and four fifths.
3 and 3/5
8/10
21