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Multiply Using Lines

After looking at http://www.youtube.com/watc... I put together this animation that helps explain why this works.  
 
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vanillalace81 (1 month ago) Show Hide
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I guess if u can't do cross multiplication, you can take the easy and long road of drawing and counting dots...
meragonmalar (10 months ago) Show Hide
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aa this is very easy
MaryStewart (1 year ago) Show Hide
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looks more complicated!
Papa515 (1 year ago) Show Hide
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The 'rainbow-method' is a description of the distributive property of mulitplication 'over' addition. In other words you can say 3*(2+5) and go ahead and add 2 and 5 and get seven then multiply by 3 getting 21 or if you want to you can say 3*2 + 3*5 getting 6 plus 15 which (for sure) comes out to be 21
okslauqk (1 year ago) Show Hide
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thx a lot
italianobro (2 years ago) Show Hide
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the first part existed in texted books i forgot the real name but my teacher calls it the rainbow methode
SoulCheese77 (2 years ago) Show Hide
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"srry but i didnt get this at all exept the tic tac toe like part"

I hope your not in High School or graduated...
Simple Algebra.

Btw do you know the name of the mathematics using lines?
Papa515 (2 years ago) Show Hide
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The correspondance between the distributive property of multiplication over addtion is not easy to follow. Certainly doing multiplication that way is very wierd. But the multiply using lines is precisely just that.
kewlkid147 (2 years ago) Show Hide
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srry but i didnt get this at all exept the tic tac toe like part
tbsmar (2 years ago) Show Hide
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ahhhhhhhh to much math
make it stop ahhhhhhhhhhhhhh

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