A Conversation for Tips on How to Make Commuting Bearable
Are you the SquareRooter?
ViveAnn Started conversation Dec 11, 2004
Square Root of Five-digit Numbers
If you haven't got a book handy, then a commute is a good time for thinking abstract thoughts. One such abstract thought came to one Researcher who practises doing approximate square roots of five-digit numbers in his head.
Some people have way too much time on their hands...
***Self-depreciating humour. I salute you for being modest.***
But what really made me say,
"Whew. Holy Shit. I have the basic grasp on Mathematics, but this guy is way up in the ivory tower of Math."
WAS THE BELOW
***I have to say, "You are amusing."***
I invented this method while waiting for the number 9 bus in Southend. If you practise while you're on the tube you can get quite good at it, and then your friends will start calling you 'Rainman'. There is probably a better way of doing this, but I like this way because I thought of it by myself.
Remember the squares of the numbers from 1 (1) to 31 (961)
Think of a five-digit number: 65741
Take the first three digits: 657
What's the largest square number immediately below this? In this instance it's 625 (25 squared). Remember the square root of this number (ie.25) - the square root of 65741 is going to be 10 x this number
So the square root of 65741 is going to be 25n.nnn
>>okay... I believe you for no other reason but for the fact that I do not squareroot.
>>>alright... laugh at my ignorance.
Key: Complain about this post