Hello everybody Today we're gonna talk about math In my channel I speak about curiosities, mathematical curiosities Basic mathematics, high school mathematics, calculous Everything about mathematics Parodies! You will learn mathematics and you will have a entertainment time YEEEAAAH! !
! ! !
I love it! Entertaining time Good good! So, I noticed that besides loving math, you also love languages, right?
Yes, I know English and I know Spanish as well And how did you learn these languages? By myself! Playing video games, listening to music, watching movies with English subtitles.
It helps a lot. And how did you improve your speaking? By hosting people from all around the world - I hosted people in my house - Really?
- In Rio, right? So you have a lot of tourists there - Yes I hosted about 200 people in my house - Come on, 200 hundred? !
- Yeah, 200 hundred! Do you remember this number? Good!
- Gooood! Excellent! !
- Oh yeah, I'm good You good! Excellent, come on! Exactly, very good!
So let's talk about the math operations now Rafa What are the four basic math operations? We have: addition, subtraction, multiplication and division - These are the four basic ones, but we have other ones - Okay We have, for example, percentage. We have fractions We have exponentials - We have logarithms - Okay - We have square roots - Square root So, let's talk about addition Addition because we add something When you go to Facebook for example and you add someone Sometimes you say "I add" Add on Facebook Two add two For example Is equal to 6 or is 6 Exactly!
Some, some people. There are some people here So, what's the sum of two and two? - Four - Four, exactly - So let's talk about subtractions - Subtractions How much is.
. . Minus, minus two.
. . Minus, minus is plus So.
. . It's six!
So now let's talk about the third math operation which is division Division! Let´s go And how do you say "dividido por dois" Divided by. .
. Or, if it is a fraction, we can say two over two It´s the same thing as one Multiplication! Two times two is equal to four And do you have any tip for us to memorize the times table?
Because some people can may find it kind of hard - The most viewed video of my channel, is the one that I teach how to memorize a times table - Oh good! Actually, you don't have to memorize the times table Because you already know it Do I ? Because you just have to know the times table of one, two, five and ten Tell me more about it - For example, if you have seven times eight, which almost nobody knows.
How much is it? - Yeah, I have to think a lot So you can transform the seven in five plus two Five plus two is seven And then you apply the distributive property - Five times eight and two times eight - Okay Five times eight? Fourty!
- Two times eight? Sixteen - Sixteen - So it´s sixty. .
. Okay - Now you add - Fourty plus sixteen, fifty six - Fifty six Very easy It´s a nice trick You just have to know the times table of one, two, five and ten Nineteen times eight. .
. Well I can transform the nineteen on a twenty minus one Alright And now distributive property Twenty times eight is one hundred and sixty One times eight is eight. So now you subtract One hundred fifty two Subtraction now Two hundred and fifty minus thirty four.
. . It is two hundred and sixteen Excellent!
And now addition, okay? The last one One thousand and twenty five plus three hundred and fifty So it is one thousand three hundred and seventy five Exactly, good! - I guess he's good - Thank you very much!
Oh yeah, two challenges The first one is the easy one - Pause the video you. . .
pause the video, try to do it - Pause the video Now the second one is an arithmetic challenge for you So nine minus three divided by one third plus one. How much is it? I have no idea So thank you very much Rafa for helping me with this video Thank you very much for inviting me to make this video with you I'm really happy, and I'm surprised because your English is great!
Congratulations Thank you very much teacher. Your mathematics is great as well Just for the easy one, because the other one I have to think a lot, I don't know - Just the basics -Yeah, just the basics So, I hope you like this video If you like this video subscribe to "English in Brazil" and to "Mathematics River" WE'RE TOGETHER! We're together, yeah!
Bye bye, see you!
