It is: 4/5 minus 4/15 = 8/15
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3 fifteenths minus 5 fifteenths equals minus 2 fifteenths.
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One-third is the same as five-fifteenths. Two-fifths is the same as six-fifteenths. Five-fifteenths plus six-fifteenths is eleven-fifteenths. One, or fifteen-fifteenths, minus eleven-fifteenths is four-fifteenths.
Eleven fifteenths minus ten fifteenths is equal to one fifteenth.
Find the "common denominator". 2/5 is 6/15. So 1 fifteenth minus 6 fifteenths is minus 5 fifteenths , or minus one third