3 ms·

There's probably some minimum that you need, like maybe multiplication up to 10x10, and squares up to 20 or 30. I like the idea (though not the name) of mental

There's probably some minimum that you need, like maybe multiplication up to 10x10, and squares up to 20 or 30. I like the idea (though not the name) of mental math. I think that if all you teach someone is multiplication tables and long division/multiplication, then they'll be as lost without a pencil and paper as someone who doesn't know the tables is without a calculator. I can see a case for learning mental math to solve small-number problems quickly, but really, anything I would want to do longhand, I (and most anyone else) would just use a calculator. Really why I think long multiplication/division became popular? It's easier to grade homework. If a student hands in just the answers, who can say whether they did it in their heads or with a calculator?

rkts 19y ago
> why I think long multiplication/division became popular? It's easier to grade homework. No, it became popular because it used to be necessary. Math education (at all levels) is designed to teach 'how' rather than 'what' and this made sense when computation was something you had to do on paper. As to why it hasn't adapted, my guess is politics. There are too many people who lack any capacity for abstract reasoning but squeak through math classes by memorizing rules and procedures. These people naturally make a fuss when the rules and procedures are taken away and they start doing poorly.