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I think students need an assessment that measures their ability to apply skills practiced in an earler lessson, like determining the thickness of the alumninum foil pieces. If you are teaching students about density, I would give students two jars of the same ounces of pickles. I would ask them to determine which of the jar contents are more dense.

Students would have to measure the length and width and mass of the pickles, to determine it's density.

(I think)

If they could prove their conclusions(even if incorrect), I think this would determine if they learned anything.