5.1 into a fraction = 51/10
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510/100 = 51/10
510 is an integer and so there is no sensible way of writing it as a fraction or mixed number.
1/2
510 ~ (510-360) ~ 150 Cos 510 = Cos 150 = - Cos 30 = - ( radical 3 ) / 2
Multiply it by 100 giving 51000%.