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.
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.