A great question came up in class after we reviewed our own grades in Illuminate. "How come if I have more As than Bs, do I only have a B?" The answer lies in the weighting of grades. A quick activity done as classwork may earn a 10/A+ but only be worth 5 points in the grade book. An end of Unit Math test that covers 3 weeks of material and earns an A+ is worth 100 points. An A on the Unit Test is worth much more than an A on classwork. You can't take a simple average of the grades listed on the grade sheet because different tasks have different weights.
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