I'm sure some of you have wondered "how does Mr. V. know all these tricks?" One reason is because I have learned this set of arithmetic properties here:
http://www.coolmath.com/prealgebra/06-properties/
Many of you are already using these without knowing it. The multiplicative inverse property is used in solving proportions through butterfly method.
The additive inverse property is used to solve for x in linear relationships when y is constant.
I just like the way the concepts are presented at coolmath. I hope you do too.
Oh, and if you don't learn them now, you will continue to struggle and will probably have trouble in the rest of your math career through high school and possibly beyond.
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