Find the Greatest Common Factor GCF in two seconds!

The greatest common factor (also called the highest common factor) is the highest number that divides exactly into two numbers.
Forget factor trees - this method is faster and neater, and gives you a better change of success!
Another tecmath math lesson brought to you by tecmath the math mad math man!

[linnyLynz]

Oh my gosh! Thank you for this technique! I've always struggled finding the GCF of larger numbers and this just made it much more easy and simple!

[willmoran]

Thank you so much my teachers way takes like 20 minutes each

[charleseiii]

thank you SO much. i've always struggled with finding the GCF, especially with larger numbers and this helped me immensely. thanks!

[gelidloni]

This video was a life saver! You made this so simple and sensible. Thank you!

[BabyandLittleGuy]

Thank you for your easy-to-understand instruction! This is much simpler, no "tree" method, no squaring, etc. I did other problems in a matter of 10 - 20 seconds! :).

[johnhagan]

A good initial test is to subtract the smaller number from the larger number. The GCF is either that number or a factor of that number. In each of the cases in the video, the difference test would have found the GCF instantly,

[trigospike]

Thank you soooo much I have a GCF quiz friday and I needed alot of help I thought I was gonna fail thanks

[brandiduncan]

SO genius!!!! This is a huge help to this homeschool mom!!! Glad I found you!

[elguguicrack]

Thank you so much I have a math test tomorrow about this and I didn’t understand that much thank you you are a hero

[RealTraumaHealing]

Hi Sal
I think you are the best on YouTube. You have the kindest voice, you are a pleasure to listen to. Most importantly, your methods are the easiest. Can I ask, what if you chose another factor eg. 3 instead of 9? Some of us aren't as quick as you Sal. lol :-)

[ShawnVerne]

Thank I’m helping my son with math and this method is unbelievably simple.

[glowflow]

For 72 and 108 can you do
72 and 36
(2) 36 54
(2) 18 27
(3) 6 9
(3) 2 3

2x2x3x3= 36 TechMath please answer my question, isn't this a valid way to work out the GFC?

[ChristsBeloved]

I know I already subscribed but I just wanna say that you are a genius 🙂

[ahnafaizah]

Thanks sir! You helped me a lot. Where are you from, sir?

[wherearetheavacadosxx]

This is a amazing video thanks so much it helped me like crazy I was so confused and now I’m so confident thx so much keep doing what your doing cause it’s amazing

[alvaromuto]

This is the way I've been taught to do it :( unlucky that for the first one I can't learn a new trick :(

[nikki]

It is actually a lot easier with the Euclidean Algorithm, once you understand that. Espacially with your examples: 72 - 60 = 12. 108 - 72 = 36.

[kazandrachristeaaligato]

Thank you very much, it's really helpful

[paris]

Could you clarify something for me? When finding the GCF of 72 and 108… I understand the 9 and the 4, but I don't understand why 2 wasn't included. Thank You!

[glowflow]

Highest Common Factor and Greatest Common Factor are the same, right?