Expressed as a mixed number in its simplest fomr, 11 2/5 - 8 1/3 = 3 1/15 or three and one fifteenth.
Expressed as a decimal, this is equal to 3.06 recurring (that is, 3.06666..)
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One whole and two fifths
Call it 21 fifths minus 13 fifths, ie 8 fifths which is one-and-three-fifths
One third is greater than two fifths.
six and three fifths
Find the "common denominator". 2/5 is 6/15. So 1 fifteenth minus 6 fifteenths is minus 5 fifteenths , or minus one third