7 - 8 = -1
1 - 4 = -3
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78 is 78/1 in fraction.
Subtracting a fraction is the same as adding its negative.
.78 = 39/50
78% is 0.78 as a decimal and 39/50 as a simplified fraction
7.833333333 = 7 833,333,333/1,000,000,000 or 7,833,333,333/1,000,000,000 . If the decimal part were indicated as repeating/non-terminating/goes on forever, then it would be 75/6 .