Fractions of a revolution make sense, e.g.
360 degrees = 1 revolution
180 degrees = 1/2 revolution
137 degrees = 137/360 of a revolution
2pi radians = 1 revolution
1 radian = 1/(2pi) revolution
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To find the half of a fraction, multiply the given fraction by 1/2 or 0.5.
Remember that in math, "of" usually means "times". To find a fraction of a fraction, multiply them.
You turn the decimal into a fraction. Then you can find the equivalent fraction.
To simplify a fraction, find the GCF of the numerator and denominator and divide them by it. If the GCF is 1, the fraction is in its simplest form.
There is no such fraction. For any fraction, you can always find a fraction that is nearer to 1 - for example, the average of the fraction and one.