7 x 7 = 49 6 x 8 = 48 5 x 5 = 25 4 x 6 = 24 10 x 10 = 100 9 x 11 = 99 One of my 3rd Graders pointed this out while we were looking at the multiplication table. Great! Challenge: make a diagram that explains this to a 3rd Grade class. What I did is below... (1/2)
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Replying to @mpershan
Lots more to this story. E.g., 3x1 = 3 1x2 = 2 5x2= 10 3x3 = 9 7x3 = 21 5x4 = 20 9x4 = 36 7x5 = 35 It's the tip of an iceberg. Challenge: expose the iceberg.
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