- View SourceI see his way as simpler than the last explanation...

34 x 86 is 2 x 17 x 86 which is 17 x 86 x 2 which is 17 x 172, which is 17

x 170 + 17 x 2 which is 17 squared x 10 plus 34, which is 2890 + 34 = 2924.

Best wishes, Ian

-----Original Message-----

From: MentalCalculation@yahoogroups.com

[mailto:MentalCalculation@yahoogroups.com]On Behalf Of tradewebhosting

Sent: Friday, 15 June 2007 4:03 AM

To: MentalCalculation@yahoogroups.com

Subject: [Mental Calculation] Re: 34 x 86

How did you come to 17 x 172 = 289 x 10 is there some quick way.

Mark

Yes, i know its late , but i read the last messages now.

I prefer this way : In 34 x 86 I hear "seventeen , seventeen.." ,

i.e. 34 x 86 =

17 x 17 2 =

289 (x 10) + 34 = 2924

Best wishes.

Javi.

[Non-text portions of this message have been removed] - View SourceIn fact, since the ratio first digit:second digit in the first number (3:4) is the same as the ratio second digit:first digit in the second number (6:8 = 3:4) then both figures can be reversed.

Therefore the answer is the same as 43x68, and the sum can be negotiated this way if that's easier.

Andy

----- Original Message ----

From: Trade Web <tradewebhosting@...>

To: MentalCalculation@yahoogroups.com

Sent: Saturday, 16 June, 2007 6:41:06 AM

Subject: Re: [Mental Calculation] Re: 34 x 86

34 x 86

this is the way I do it as a beginner.... .

I put the

34 (over the eighty six)

86

then I multiply

6 x 4 = 24

then I add 6 x 30 = 180

so then I get 204

then I add 80 x 4 = 320

so then I get 524

then I multiply 80 x 30 and get 2400

and add it to 524 and get

2924

thats how I multiply 2 x 2 digit numbers.

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