I often wonder why we don’t teach the ‘divides tables’ too. Useful for estimating and mental arithmetic.
When teaching kids I avoid memorization. E.g. my 7 yo knows lots of tricks for mental arithmetic, but doesn't "know his times tables."
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do you find that sufficient? eg, does he have problems with multiplying large numbers outside the domain of the union of the tricks?
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while it's certainly not necessary to know all of it by heart it's helpful. Knowing the 2s & 3s (+5s) ones makes calcs quicker
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knowing times tables is a mental trick that helps you to quickly operate on larger numbers
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btw this is coming from someone who found deriving trig formulas during exams more reliable than memorizing them
End of conversation
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I like both. Memorizing huge amounts of math & words seems to strengthen synapses + automaticity is a *gift.*
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always wish I had memorized compounding and natural log tables as a child a la warren buffet
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Will you eventually introduce times tables? It seems counter-intuitive.m, but some school systems have abandoned them.
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Is there a webpage for that stuff?
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pls share some of the tricks of mental arithmetic in a blog or series of tweets. My 7 yr old is very interested in Math
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