DS (who is 10) was moaning in the toy shop earlier because we were looking at toys for his sister, and so to keep him quiet I asked him 26x26, 28x28, etc., which didn't take him long, so gave him 112x112, which he said was 14 squared times 8 squared (which is true), and came up with the answer I think based on 14^2 [196] x 8 x 2 x 2 x 2.
Anyway are there any tricks to do harder mental arithmetic that I could perhaps teach him?
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Maths tricks
2 replies
joanbyers · 18/11/2012 18:07
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