LinkBack Thread Tools Search this Thread Display Modes
  #1   Report Post  
JAXAshby
 
Posts: n/a
Default uffda.

I suppose she couldn't have been too bright.

Rick


she could multiply 3-digit numbers in her head, and not take more than a second
or two. I saw her do, many times, such as calculate the price per pound of
5-3/4 ounces at $0.37 as compared to 8-3/8 ounces at $0.51 compared to 1 pound
2-1/2 ounces at $1.17 and pick up two of the 8-3/8 ounce size.

btw, she worked as a code breaker in WW2.

  #3   Report Post  
JAXAshby
 
Posts: n/a
Default uffda.

want to see 254 * 256 in my head?

okay ends in 24

next digits back = 650

answer is: 65024

literally, done in my head that fast.

no smoke, no mirrors.

I can just imagine Jax trying to emulate her.
Jax, "lets see 000 X 000, is.......ummmmm......errrrrr..... HEY MA ??!!!"

Shen


I suppose she couldn't have been too bright.

Rick


she could multiply 3-digit numbers in her head,











  #4   Report Post  
JAXAshby
 
Posts: n/a
Default uffda.

answer is: 65024

literally, done in my head that fast.

no smoke, no mirrors.


however, there was a "trick", two actually.

First, two numbers multipied together that differ by two will give a product
that is 1 less than the square of the number between them.

Second, a number squared that ends in 5 gives a product that ends in 25, and
the other digits are equal to the remaining digit(s) times itself plus one.

Got it?

jeffies wife will explain it if you ask her.


  #6   Report Post  
JAXAshby
 
Posts: n/a
Default uffda.

yeah, sure.

I, on the other hand prefer a visual
memory method.

Shen



 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules

Smilies are On
[IMG] code is Off
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Uffda!! What a bunch of dummies JAXAshby ASA 1 March 11th 04 06:16 PM


All times are GMT +1. The time now is 06:32 AM.

Powered by vBulletin® Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Copyright ©2004-2025 BoatBanter.com.
The comments are property of their posters.
 

About Us

"It's about Boats"

 

Copyright © 2017