Ratios are made with a couple of large integers : the numerator which can be any number, and the denominator which has to be positive. They represent fractions of integral numbers. They are written with a slash and no space.
ikc3> 1/2 + 2/3
7/6
ikc3> 1/2 * 2/3
1/3
ikc3> 1/2 / 2/3
3/4
ikc3> 1/2 - 2/3
-1/6
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