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Locaha comments on Group Rationality Diary, July 1-15 - Less Wrong Discussion
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Comments (35)
I have this crazy idea to use Anki to learn the multiplication table to 100x100, to be able to multiply large numbers fast. The only problem is, it seems both pointless and impossible, :-)
Have a look at this blog post where, among other things, some kind of return-on-investment is calculated for learning multiplication tables further than 10x10.
Awesome, thanks.
I was expected to learn decimal equivalents for fractions up to 1/9 (including 2/9 etc.), and I use them now and then.
Instead of working on the higher multiplication tables, why not learn methods of approximation?
Funny that you mention fractions, I started learning them a week ago. Though I can't say I even encountered decimal 1/7 in real life...
If you read a comment on LW that's downvoted to -5 and says "14% positive" this means it's received 1 upvote out of 7 total.
If you remember all of the repeating digits (142857) then you can also identify 28%, 42%, 57%, 71%, and 85% as 2/7, 3/7, 4/7, 5/7, and 6/7, respectively.
That's not impossible. Not particularly worthwhile but possible.