# Messages List

5274

### Facebook group?

Do we have one? [Non-text portions of this message have been removed]
nth_fields

Nov 9

#5274
5273

### Re: Check out my new yahoo group NumberSurfing

Yes, I would like to join your group. Send that invitation. [Non-text portions of this message have been removed]
useezero

Nov 9

#5273
5272

### Re: Check out my new yahoo group NumberSurfing

Good afternoon 'Seezero'. Unfortunately, I am presently unable to access your links; I believe they would have been disabled by the automatic removal of
George Lane

Nov 9

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5271

### Check out my new yahoo group NumberSurfing

I started a yahoo group called 'NumberSurfing'. I'm having trouble trying to get members to join but I think this is a good idea. Number surfing as I coin it
useezero

Nov 7

#5271
5270

### New file uploaded to MentalCalculation

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the MentalCalculation group. File : /MSO
MentalCalculation@yahoogroups.com

Sep 27

#5270
5269

### New file uploaded to MentalCalculation

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the MentalCalculation group. File : /MSO
MentalCalculation@yahoogroups.com

Sep 27

#5269
5268

### New file uploaded to MentalCalculation

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the MentalCalculation group. File : /MSO
MentalCalculation@yahoogroups.com

Sep 27

#5268
5267

### Re: Finding the squares of numbers

Good afternoon Ralf, Sorry, you made a typing error: it should be 10000 - 1500 ( one more zero) + 44. Best regards, Willem B. Van:
A.W.A.P. Bouman

Sep 20

#5267
5266

### Re: Finding the squares of numbers

I use a simple form of that approach with my kids. Learn the squares thru 25 then , eg, 15 sq = 225 so 14 times 16 = 224, 13 times 17 = 221 etc to teach them
Foley, Stephen

Sep 19

#5266
5265

### Re: Finding the squares of numbers

Hi guys, True, but for this kind of 2x2 there are several ways to short-circuit the process. 89 = 100-10-1: 96x89 = 9600-960-96 = 8544 (there is here even the
George Lane

Sep 19

#5265
5264

### Re: Finding the squares of numbers

Hi folks, Ralf, that is an excellent approach. I had viewed 89 as (100-11) and 96 as (100-4), but I had not thought of seeing both aspects simultaneously. Many
George Lane

Sep 19

#5264
5263

### Re: Finding the squares of numbers

Hi Everyone.. I think you should not spend time in calculating multiplication of any two digit numbers, simply memorize them using memory techniques! It would
The Vagabond

Sep 19

#5263
5262

### Re: Finding the squares of numbers

Hello everyone, For 89 x 96, for quickest speed, I would rather use a Vedic method : A. The first 2 digits are 89 - 4 = 85 B. The last 2 digits are 4 x 11 =
nodden_1984_mes_gr

Sep 19

#5262
5261

### Re: Finding the squares of numbers

Hello, it is an interesting observation for me that mental calculators seem to prefer addition instead of subtraction (and indeed, it has been shown that
ralf_laue

Sep 19

#5261
5260

### Re: Finding the squares of numbers

Hi Paul, Yes, that's just about it - except that it is usual to perform the calculation from the right hand end of the numbers. For instance, with 123 x 456 we
George Lane

Sep 19

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