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9/10 of 45 equals 40.5
Since 0.8 is equal to 8/10ths, -0.8 is equal to -8/10ths and -0.80 is also equal to -8/10ths. If you simplify -8/10ths by dividing the numerator and the denominator by 2 you get :-4/5ths
9 10ths
9/10
The answer is 9.