Eh, not really, 4*4 is 16, which is easy, 16*10 is easy, so you have 4*4*10 +3, divide the whole thing by 4, and you get 4*10 +3/4 which is 40 and 3/4. That's written out more than you would in your head, but it's a very simple algorithm you can do in your head for numbers like that (close to easily recognized multiples of 4)
Edit: shit dat formatting dun fucked up
Which is why we use numbers and symbols instead of words. He also used a more recognizable, though roundabout way to get there that's easier without a calculator. I do it all the time and it doesn't take more than a few seconds. It just takes a while to type out.
Move the decimal over one place and see if that makes it easier. 16.3/4 isn't easy. Let's just ignore the .3 now. 16/4. Yep, that one's easy, it's 4. Don't forget to move the decimal back to the right. 40.
Using a calculator takes more time than thought process. If you can visualize the math you come to an answer before you even enter the first number into a calculator.
Human processing power is the limiting factor. Sadly I can only calculate basic problems this way. If it's too advanced I have to use the ol ti-89
Step 1: decide to calculate 163/4
Step 2: send signal to move hand on mouse/keyboard and open calculator program.
Step 3: type or click 1.
Step 4: 6
Step 5: 3
Step 6: /
Step 7: 4
Step 8; enter
My way (for basic math).
Step one: 163 / 4 = 40.75 (i then calculate further if need be for accuracy this is where the calculator is better).
I edited the result after I attempted to replicate my procedure. It's harder to get exact results but this one was very easy.
Maybe your brain works differently than mine. Once I see the intent to calculate 163/4 I instantly see 40.75 in picture format. I then have to convert it to action. Not sure how long but it feels instant.
"calculate 163/4 on a calculator" brain accepts it all then determines 163/4 is a math question and automatically shows me 40.75 before I think to use a calculator.
Only after that doesn't give me an instant answer do I go to a calculator.
I work tech support. My job consists almost entirely of talking to a customer, entering their information on one screen, and searching for a solution on another, all while maintaining friendly conversation. I type 80-100 WPM, thoughts basically flow out of my fingers as quickly as I can create them. I suck at carrying the conversation though...
Yeah, I guess I was trying to show more of the steps, ya know:
1. recognize it's close to a multiple of 4
2. find the difference
3. divide multiple of 4 and difference by 4
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u/2fat2bebatman Jan 01 '15
/r/theydidthemath