Proportion and Slope
It
focuses on graphically showing the idea of proportion, and the
equivalent fractions for solving directly proportional problems.
Attempts to show what is routinely done with cross multiplication.Shows
the slope, the ratio, the proportion between two numbers, and allows
applying that proportion to other numbers, whether they are greater or
less than the initial one.
Graphically the proportion is fixed with the red bars.
The blue dot slides down the slope fixed by the proportion
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