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Alternative Multiplication Method

Name: Anonymous 2010-05-03 4:47

Name: brenna 2010-05-03 17:48

Name: Anonymous 2010-05-03 19:42

>>1
What the fuck am I looking at?

Name: brenna 2010-05-03 20:15

different algorithm for multiplication

45 x 256 = 11520

the upperleft most box is representative of 2 x 5
the tens unit is written in the bottom triangle
the ones unit is written in the top triangle

repeat for all boxes

finally add the digits that line up diagonally
carry over ones if necessary

http://tinypic.com/r/24c5r1l/5

Name: Anonymous 2010-05-04 3:52

Thank you Brenna

Name: Anonymous 2010-05-05 0:42

I suppose it is cute.

Name: Anonymous 2010-05-05 4:25

Here's a another method it's similar to the Lattice one; I dont know what it's called http://i43.tinypic.com/dw5lrr.jpg

It's meant to be 21 x 3 something. Apparently it's really quick and easy to do in your head ergo very useful.

Name: brenna 2010-05-05 10:00

>>7
I've never seen that method before but I like it

for the purposes of mathematical education which algorithms do you think should be taught? standard only or the "invented" ones as well?
curious future math teacher here

Name: brenna 2010-05-05 10:03

>>7
I can make your method work for two digits x one digit but how would I go about multiplying two two digit numbers?

Name: Anonymous 2010-05-05 14:05

>>9
i dont remember the full method but its covered in this book called: "Alex's Adventures in Numberland" I'd say you should be taught everything. Different people find different methods useful.

Name: Anonymous 2010-05-05 21:51

alright, I've figured out the diagonal addition to get the first sums, but what is the secondary numbers on the outside? :/

Name: brenna 2010-05-07 14:52

Name: Anonymous 2010-05-09 17:34

I doubt all of what you said is valid.

I've heard of Liberals who hate that we're still fighting a war in the oily East but little of Conservatives who do more than angst the fact.  Instead, they're rather angry the White House is trying to force/delude with an arbitrary pull-out date that they keep moving around.  Additionally, criticism of President Obama has been about his non-military international efforts and his domestic program, not his "overseas contingency" conduct; has Limbaugh called him a war criminal yet (has he?  I don't listen to the guy but I know if there's something radical to say he'd be the one to willingly say it whether or not other people believed it)?

As for the effort to now expand oil drilling, this is nothing new.  There has been some desire to push for expanding energy such as domestic oil drilling and nuclear construction for a number of years now, often little reported.  In fact, a lot of territory off the coast of California is already well-documented and mapped and Shell or ExxonMobil could get working on an unobtrusive method of oil extraction within a month were they allowed to tomorrow.  Those who push for the expansions now probably are using the war to try and tug heart strings - after-all, who wouldn't want to make it less likely we'd stay entangled there for the wrong reasons? - but is more a reaction to what is seen as an unrealistic Green national energy plan.

http://www.digitalnasties.com/shop/theres-always-wednesday-p-12.html

Why?

One word: Immigration.

Since 1970, America's largest source of immigrants has been Latin America, especially Mexico. More than half of these Latino immigrants lack a high school diploma.

Compare the U.S. experience with Canada's. More than half of all immigrants to Canada possess a university degree. Half of all Canada's Ph.D.s are foreign-born.

Why does America choose poorly educated immigrants? The short answer: America does not choose them. They choose themselves.

In the last decade, half of all the immigrants to the United States arrived illegally. Even many of the legal arrivals gained entry courtesy of relatives who originally slipped into the country against the law, then somehow regularized themselves.

By contrast, Canada (a country of 1/10 the U.S. population that takes proportionately many more immigrants than the United States) allows almost no illegal immigration.

The result: While immigration has enhanced the average skill level of the Canadian population, it has detracted from the average skill level of the U.S. population.

Many Americans carry in their minds a family memory of upward mobility, from great-grandpa stepping off the boat at Ellis Island to a present generation of professionals and technology workers. This story no longer holds true for the largest single U.S. immigrant group, Mexican-Americans.

Stephen Trejo and Jeffrey Groger studied the intergenerational progress of Mexican-American immigrants in their scholarly work, "Falling Behind or Moving Up?"

They discovered that third-generation Mexican-Americans were no more likely to finish high school than second-generation Mexican-Americans. Fourth-generation Mexican-Americans did no better than third.

Name: Anonymous 2010-05-12 0:57

it's just lattice multiplication. if you're like me and you separate out a number into categories of scalar multiples of powers of 10 (ie 4519 becomes 4000 + 500 + 10 + 9), then when multiplying, use the scalar powers of 10 to get the sequence of operation.

for instance when multiplying 36 x 48. you can do 30*40 + 30*8 + 6*40 + 6*8. its not fully reduced to prime multiplication but since most numbers like 30 are values we've all used constantly for such a long time.

anyway the pattern works from right to left, the diagonal line means if it's under a 10 or not, kind of. basically it gives you a number that you multiply by the order of 10 that column corresponds to in respect to the original numbers. on paper it seems stupidly complex but your mind does this. when multiplying 40 x 500, you first do 4x5 to make 20. that's where that number would go in the diagonal thing, 2\0. then you have to multiply by powers of 10. 20*1000 (40x500/1000 = 4x5). you may happen to do this by just counting the total number of zeroes at the end of each operand. this makes 20 000.

those secondary numbers on the outside are the original values obtained by the method i just said with the "carried over" values from lower order values applied. for instance, that 12 on the right on the image is a 2 with a carried over 1. if you look at where it would carry over, that 4 becomes a 5. makes sense?

k thats pretty much it to this thing

Name: Anonymous 2010-06-12 9:28

It's called cross multiplication

Name: Anonymous 2010-06-14 0:24

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