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Ways to represent multiplication

Sal explains different ways to represent 7 times 5. Created by Sal Khan and Monterey Institute for Technology and Education.

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• what is the trick for nines
• a really awesome way to multiply the 9 times tables really fast is to use your haands! literally! take 9x2 for example,spread out your fingers and pull down the 2nd closest finger to your left.On the right side of the separation is 8 fingers and the left has 1.Put the left amount of fingers down first (1),THEN put the right one(s) beside it.for 9x3,put the third finger closest to the left down.2 on the left,7 on the right and there is 27!this goes on and on till 10x9.9 on the left,0 on the right :90! this is a really long explanation but if you think about it ,you will litteraly have that knowledge ,"at your finger tips".
• why do you need to know multiple forms of the way to represent multiplication? Why can't you always just use "x"?
• Later on there will be variables, which are usually letters like x, so it might get a little confusing. For example 6 times x plus 1 times 2 times z minus could be represented as (6x+1)·(2x-4) because (6xx+1)x(2xz-4) would be a totally different operation. Parenthesis mean that the operation inside gets done first. Hope this helps.
• you can just memorize the times tables
• is a good part to watch to answer this question.
• does * (the star ) a multulication sign to
• Yes. * or "The Star" means a multiplication sign
• what is the trick for all numbers
• 14 x 2 = 2 x 14 = 28 right ?
• Yes that is correct and that is also called communicative property
• i am have trubles remember few multiplication tables
• Hello Teresa! The best way to remember your multiplication tables is practice. Making flash cards is one great way to do this. If you take a little amount of time out of each day I promise you that within just a few days you will start to find yourself remember your multiplication tables. I hope this helps! :)