2/4 = 1/2
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For people who are not familiar with fractions it is easier to compare them in the form of unit rates.
A unit fraction is a rational number written as a fraction where the numerator is one and the denominator is a positive integer. A unit fraction is therefore the reciprocal of a positive integer, 1/n.
Unit fractions all have the same numerators but the denominators can be different.
One unit to a unit which is a multiple of ten times as small.
It can be rounded to 9 units.