Negative 5.
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One whole is nine ninths. Nine ninths minus four ninths equals five ninths.
One gallon minus one quart equals three quarts. There are four quarts in a gallon. It also equals 96 ounces. There are 128 ounces in a gallon and there are 32 ounces in a quart. 128 minus 32 equals 96.
-3 - (-1)= -3 + 1= -2-2
-2 1/3 minus -10 1/6 equals 7 5/6
9 - (-1) = +10 positive nine minus negative one equals positive ten