Find the "common denominator". 2/5 is 6/15. So 1 fifteenth minus 6 fifteenths is minus 5 fifteenths , or minus one third
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Two and one fifteenth.
One whole and two fifths
Call it 21 fifths minus 13 fifths, ie 8 fifths which is one-and-three-fifths
six and three fifths
Nine tenths plus two fifths minus one fourth is equal to 1.05