Basic Math: Lesson 4 - Properties of Numbers

videomathtutor Says:

Dec 2, 2011 - Zero can cause all sorts of problems... especially to my Bank Account!

Igsr0909 Says:

Dec 2, 2011 - Oh ok, it confused me because of the zero, I thought it was another property. thank you so much for your fast reply!

videomathtutor Says:

Dec 2, 2011 - It would be, if it were written as: 2x + (--2x) = 0.

videomathtutor Says:

Dec 2, 2011 - Actually, you typed an example of the Distributive Property. To use the Associative Property, there needs to be at least 3 terms on one side of an equation.

Igsr0909 Says:

Dec 2, 2011 - Oh or is it the inverse property of addition?

Igsr0909 Says:

Dec 2, 2011 - Hi, thank you for the video! But can this be an associative property, eventhought it has an =0x at the end? (2x+ -2x)=(2+ -2)x= Ox?

MAY4BANG Says:

Aug 9, 2011 - i love your lessons.. =) it helps me refresh what ive learned before =)

videomathtutor Says:

May 21, 2011 - Good to know! More videos are on the way... in HD!

CHARLIE1NABLE Says:

May 21, 2011 - I just want to thank you for your videos. I myself haven't played or exercised with algebra for like ten years and was worried that I forgot how to write it, but thanks to you and your videos I'm totally refreshed and more confident in my algebraic writing :)

videomathtutor Says:

Jan 29, 2011 - Glad to know! More videos are on the way!

jasonhylnd001 Says:

Jan 29, 2011 - I've watched quite a few math videos on youtube and I have to say you have been the most helpful.

videomathtutor Says:

Jan 10, 2011 - The real numbers is a closed system. For other types of numbers, it need to work for all cases to be closed.

0125319 Says:

Jan 10, 2011 - Question about Closure Property. HOw about 5-3=2 In this case real number 5 less real number 3 is real number 2. Is this valid? You mean Closed when in all cases the result is the same with the variable you add or multiply, whether they are natural or real?

dizzytrizzy07 Says:

Dec 23, 2010 - okay. thanks sir ;) muchas gracias y feliz año nuevo! :))

videomathtutor Says:

Dec 23, 2010 - You swapped the terms as if they were being added. If you have 2 - ab and did a "correct" swap, to see if subtraction is commutative, you should use: ab - 2. Also, try to use values that are different when you do a substitution. 2 - 2 swapped is still 2 - 2, so that is not a good example. Try a = 3 and b = 4.

dizzytrizzy07 Says:

Dec 23, 2010 - HI SIR LUIS! 36:00 - 36:17 -- here's the example in quiz 10: 2 - ab you said that the commutative property doesn't apply to subtraction such as this. but sir, i guess, we could also swap them into: -ab + 2 cuz i tried it and it gave me the same answer. and here's what i did: 2 - ab 2- (1)(2) 2-2 =0 -ab + 2 -(1)(2) + 2 -2 + 2 =0 so i think that's also applicable :) anyway, i'm gonna finish your whole course cuz your vids were really informative. ;D thank you.

cindy125609 Says:

Jul 5, 2010 - You are the bomb! I have went trough many of these lectures on youtube and you explain things directly and to the point which for me makes absorbing this information a great deal easier for me. Thank you so much for helping us all! :D

dineshsk9 Says:

Jul 5, 2010 - I can say one word ..Great ..nothing else ..U dont know How much u r helping me ..thanks a lot ...

lowryjlo Says:

Jun 19, 2010 - Keep posting the help on youtube. Thank you so very much!

boston295 Says:

Jun 15, 2010 - Im a homeschooled student and i watch your lesson as kinda my math class, so it really helps! thanks....p.s. love your comedy

videomathtutor Says:

May 21, 2010 - Glad to know I can help!

maggot616cro Says:

May 21, 2010 - wow,you're probably the only person with helpful vids on youtube... anyways thanks,this is really helpful cause immediately after i finished high school i started LOVING math.

videomathtutor Says:

Apr 12, 2010 - You are welcome. By the way, I am a tutor, not a teacher.

Ado0o0o1st Says:

Apr 12, 2010 - i like your way how to explaining math thanks teacher :)

MathewStory Says:

Mar 6, 2010 - Dear Mr. Ast, While I have been studying for the GRE, I have been searching for a comprehensive list of basic properties of numbers to get a grasp of math fundamentals. Thank you for your hard work and lucid explanations.