1 over 2 is either known as a half, 1/2 or 0.5.
fractions that are equivalent to 1/2 are:
2/4
3/6
4/8
5/10
6/12
From this you should be able to gather that the number on the left is half the number on the right, as long as this occurs it will be equivalent to 1 over 2, or take any integer for the numerator, then multiply it by 2 and that is the denominator.
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