Basic Math: Lesson 3 - Operations on Numbers -- Part 1

Part 1 of 3. This lesson consists of providing you with a Self-Tutorial on the typical operations done on numbers. These include: absolute value, opposites, addition, subtraction, multiplication, division and simple exponents. Order of Operations is covered in detail. I also explain how to use your graphing calculator to help you perform all these operations.

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[euncha]

I like the videos very helpful

[DarknessHeartSilver]

I find your videos really useful! Thanx! I am only in Primary 5, so, the videos taught me many things which my school did not teach. I printed out some of your notes and their sooo informative!

[videomathtutor]

@Nemeca99 I would not make it positive. Not sure how you are making that conclusion. There is only one solution of -4.

[Nemeca99]

@videomathtutor so would you get two different answers if you wrote -20/5 and simplified -20 over 5? I think there was alittle misunderstanding here, you would get the same answer either way, -20 divied by 5 is -4 and -20 over 5 as a fraction is still -4, i just want to know how you made it to be postive, i understand divideing two fractions, its why i dont like useing the fraction sign when divideing, it can confuse, unless that is just me hehe, your an awsome teacher btw!

[videomathtutor]

@Nemeca99 -20/5 will reduce to -4. That is correct. There is no fraction division here, just integers, so there is not "flipping" to 1/4 here. To divide fractions, you would need two fractions. The first one stays the same, and the other one "flips" (take the reciprocal) and then you multiply. The sign rules (+/-) are the same. Please watch the Lesson 6 videos for more help.

[Nemeca99]

@videomathtutor well its more of a general quirk I have, dividing fractions is different then just dividing two numbers if I am thinking correctly. And if they dont pay attention and write down -20/5 in the equation -20 divided by 5 is -4 correct, but the fraction answer would be 1/4th which in turn would be 4 if i am correct, fractions never been my strong suit but i do love your videos and i love math because math is very fun and can do it all day and not get bored

[videomathtutor]

@Nemeca99 Can you be more specific? What is time code of video where this is given?

[Nemeca99]

@videomathtutor how would it be pos? -20 / 5 is -4? how did you get it to be positive?

[videomathtutor]

@Nemeca99 No, it would not be positive. You may want to watch "Basic Math: Lesson 6 - Fractions" for a good review on how to work with fractions.

[Nemeca99]

im not a fan of the very end because it can get very confuseing later on, if you have -20/5 and you write it out as the fraction you did then the answer will be positive, but the answer is really neg, i dont like to do fractions for division as it can get very confusing when you have fractions involved, its better to learn to do -20/5 rather then the fractions but yes it does matter where the neg is, because a neg/neg is pos and a neg/pos is neg

[videomathtutor]

@dcdcfc Teachers spend years being trained to be able to teach. ANYONE can post a video on YouTube. You have no guarantee the video is good or not. In fact, most of the math videos I have seen here done by others are not very good.

By the way, from what you wrote, it looks like you are in serious need of ENGLISH teachers! I count 2 grammatical errors in your comment.

[dcdcfc]

Who needs teachers when you got YouTube:)