3/5
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nine tenths is 90% and four fifths is 80% so nine tenths is bigger
one and five tenths or one and a half
Nine tenths minus four tenths is five tenths, which is also a half.
Thirteen tenths
9/10 - 2/5 = 9/10 = 4/10 = 5/10 or, in simplest terms, 1/2.