The scale factor typically goes on the bottom of a ratio when comparing measurements in different units. For example, if you are converting inches to centimeters, the scale factor would be in the denominator to ensure the correct conversion. However, in other contexts, such as when scaling geometric figures, the scale factor can be represented as a ratio where the numerator and denominator are interchangeable depending on the context of the problem.
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On the bottom - numerator on top; denom on bottom.
Bottom
You need to just muyiply pie and their you go.
Turn it over so that instead of the numbers going up from left to right (or bottom to top), they go up from right to left (or top to bottom).
Take the 'reciprocal' of the given scale factor to go the other way. The 'reciprocal' of a number is 1/(the number). 3 ==> 1/3 5 ==> 1/5 1/7 ==> 7 2/3 ==> 3/2 etc.