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NancyLebovitz comments on Group Rationality Diary, July 1-15 - Less Wrong
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Comments (35)
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.