### 27.7.06

## most pathetic use of a calculator

a waitress using it to work out 10 - 3 = 7

previous best was a shopkeeper doing 2.20 * 2 = 4.40

previous best was a shopkeeper doing 2.20 * 2 = 4.40

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I was trying to do 97 times 5 in calculator. But I quit. Instead I subtracted the answer of 3 times 5 from 100 times 5. Probably many people do the same thing.

by trying to do a calculation yourself, you learn these tricks which make it much much easier.

i can add much faster than a calculator and probably multiply short numbers at similar speed.

i can add much faster than a calculator and probably multiply short numbers at similar speed.

How on earth did you calculate that? Did you do time tests against a calculator? Was there an impartial adjudicator?

One of the reasons I hate some scientists:

Several months ago, I was at lunch with some friends from work. There seemed to be some confusion in figuring out how much to tip the waitress. I trotted out the old trick of calculating 15% by moving the decimal place of the bill over by one place and adding that value to half of that value to find fifteen percent. I noted that I usually tip 20% or better, which is even easier to calculate. My friends stared at me like I was retarded and asked, "are you

They are perfectly familiar with a quick method of doing the arithmetic, yet seem determined not to use it. I swear, I'm going to buy one of those stupid tip calculators and start carrying it around with me.

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Several months ago, I was at lunch with some friends from work. There seemed to be some confusion in figuring out how much to tip the waitress. I trotted out the old trick of calculating 15% by moving the decimal place of the bill over by one place and adding that value to half of that value to find fifteen percent. I noted that I usually tip 20% or better, which is even easier to calculate. My friends stared at me like I was retarded and asked, "are you

*sure*?" in a really sarcastic way. Obviously, they were already familiar with this method of mental arithmetic. However,*every goddamned time*we go out for lunch, there's a bunch of, "Hmmm ... let's see ... uh ..." when trying to figure out a 'starting value' for the tip, from which we might factor in quality of service, etc. to determine the end value.They are perfectly familiar with a quick method of doing the arithmetic, yet seem determined not to use it. I swear, I'm going to buy one of those stupid tip calculators and start carrying it around with me.

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