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I use the IM/OUR curriculum so I this is how I am thinking of these
Multiplicative Comparison:
-situations involving scale factors/scaled copies
A rectangle has a width of 2 and height of 4. A scaled copy of the rectangle has a width of 6 and height of 13. What is the scale factor?
Composed Unit:
-situations like recipes, shopping/costs, mixing colors, time and distance (constant of proportionality)
A turtle went 6 feet in 42 seconds? How far could it go in 3 seconds?