Basic Math: Lesson 5 - Factors, Multiples & Divisibility

[sisymay]

thanks so much for your videos. My daughter has been having problems with this stuff and you make it easy. We use your videos a lot for our homeschool. Thanks!

[videomathtutor]

@sisymay Glad to know! Please tell others!

[JMmaxx1]

You know I heard that an easy divisibility rule for 4 is by seeing if it divisible into the last two digits. Ex: 2644 is divisible by 4 because 4 goes into 44. By the way, your videos are awesome I've recommended them a lot and have found them very helpful myself! You are an excellent tutor! Keep on rocking:)

[videomathtutor]

@JMmaxx1 Yep! that is a good rule. More videos are on the way!

[Raeb222]

Thank you. I like your style of teaching even though you're not a teacher.

I'll be back often.

[videomathtutor]

@Raeb222 Glad to know! I hope to get more videos out soon.

[XplicitGlam]

WOOT THANKS!

[undertakeranshu]

u r outstanding....u don't waste much of my precious time..i found it helpful.....even video was long but was very knowledgeable...

[MitsuomiTakayanagiEC]

helped a lot thanks

[sherifalex2009]

Thank you so much! That helped me a lot! I am trying to study for the GRE and I have studied maths in Arabic all of my life, as I am from Egypt! You are a very good teacher!

[videomathtutor]

@sherifalex2009 Glad to know I can help. I am making GRE Test Prep videos now. They will be ready in 1-2 months (it is a big project!). I am not a teacher, just a math tutor.

[sherifalex2009]

@videomathtutor This is super awesome news! A lot of people from all over the world who are preparing for the GRE would be very interested in your videos! =)

The GRE website has provided me with some downloadable maths material for the quantitative part of the test! The started with the real numbers, and the factors, so I looked them up and I found your video! What's interesting is, you help me pronounce a lot of maths jargons while you are tutoring! Peace and respect from Egypt :)

[videomathtutor]

@sherifalex2009 Glad to know I can help! By the way, did you know the Pythagoean Theorem actually came from Egypt, originally, NOT Greece? (China invented it independently too). Much of our mathematics is actually from your country!

[Vaylemn]

Can you explain the proofs used in the divisibility rules? Memorization don't work unless there it is semantic, which is a fancy word in psychology that means something with a meaning. And things with semantic memories are better stored into memory than non-semantic memorization such as the divisibility rules, which are just rules with no reasoning until shown the proof.

[videomathtutor]

@Vaylemn I may be wrong, but I believe the formal mathematical proofs of these would involve Number Theory, which is far more advance than what I am trying to do in video. These rules are NOT that difficult to learn, so I hope you do make an effort to learn them, they are a time saver on tests.

[nebech01]

when finding the GCD why does it need to be in two separate parathesis on the calculator?

[videomathtutor]

@nebech01 That is how the operation is designed on the calculator. You can only input 2 numbers at a time in most calculators to find their GCF (or LCD), so if you have more than 2, you need to perform more times (depending on the number of terms). You may be better off just doing by hand.

[0125319]

Thanks your a great tutor! This works of yours will truly help a lot of students. Thank you and God Bless!

[videomathtutor]

@0125319 You are welcome. Please tell others about this site!

[expedition800]

I can tell you are gonna help me improve my math skills because your lessons are great and i have a feeling that im going to pass my math mid term test comming up soon thanks you. You are a great math tutor keep up great work!!!

[videomathtutor]

@expedition800 I am glad I could help! Please tell others about my videos!

[iXamy1]

Thanks for this lesson,I earch this because I've been 75 in Math..Thanks for the lesson!

[supersman100]

this is helpfull

[MrPacman187]

I like the way you teach Im a visual learner so this really helps and I finally feel like Im gonna be prepared for the math on my ACT college exam.

[technoboy187]

i noticed on the LCM warning when u should not multiply the numbers would you be able to multiply them then divide by how many numbers there are in the question?

[videomathtutor]

That may not necessarily work. I would suggest you just try doing it the way I recommend.

[MrWannabefree]

thank you so much my son, loves these videos..again thank you so much for making and posting these videos..wonderful

[1984laurakemp]

How do I get the paper work tests you keep refering to. I am really enjoying your video's ! If I had a teacher like you I may have got GCSE's lol .

[nenaliliana]

wow thank you so much!!!

[BFem1985]

Brilliant! Thanks, what a great teacher - explains things very clearly.

[volttackle21]

If 1 isn't prime or composite, then what is it (Besides being a ordinal , real, and natural number)?

[videomathtutor]

1 is Unitary.

[volttackle21]

Thank you =)

[DarknessHeartSilver]

But my teacher said that 1 is called a special number.

[videomathtutor]

Well, I would not use that term. Any number can be considered "special." I am not saying your teacher is wrong.

[DarknessHeartSilver]

Thank you very much! I just love your videos! I'm in Primary 5, and your videos taught me many many things not on my Maths syllabus! You rock!

[andy17704]

@DarknessHeartSilver your a special child :)