rise/run x 100 is the percent of slope of a ramp, set of stairs, a street, and so forth.
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Rise over run
The slope is the rise over the run, like a fraction. Rise is the numerator, run is the denominator. That gives you a fraction. Then just divide if you want a number.
Whether both are positive or not, you divide rise / run.
Divide the height of the ramp by the length of the ramp (rise over run).
The slope is defined as (rise) divided by (run). It doesn't matter which oneyou measure first, as long as you divide them in the right order.