This Channel Serves videos about Math and Other Sciences related to it.
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GREAT VIDEO!! I absolutely agree with whatever you said in this video, I do these because I always discusss answers with my friends, so everyone should understand each other's solution. Also I don't want to subscribe because I don't really know if I will remember to watch your videos regularly, when I do I will definitely subscribe!! Thanks for the video btw.
While not mental math I observed some fast math in Japan in 1965. I was in the Navy and the ship stopped in Japan for a few days, so I went shopping mostly in electronics stores. The salespeople in the Japanese stores were not using calculators but abacuss. I knew what an abacus was but had never seen one used. These Japanese had been using them since childhood and were masters at it. I could not believe how fast they could move those beads on the abacus and have a mathematical answer. It was as you say faster than a calculator.
my maths is very weak and frighten also very much.i wants to understand the tricks so i can do the calculation very easily with intresting .from vaishali khanduri.
I just started a math channel where I explained the entire unit circle, (a three hour topic), in 2 minutes! I will continue to make videos like these that are super fast and informed! Please subscribe! :)
What you said about having good math handwriting being different or not mutually exclusive with having good general handwriting makes a lot of sense. I have really nice handwriting but the moment numbers are brought in it looks like a child wrote it, and im unsure why, could have to do with the way my math skills were neglected when i was young. But its interesting to hear that be mentioned. Thanks for the nice video!
The easier way would be divide by 6 because if a number is a prime number then it would be of the type 6m-1 or 6m+1 but converse is not true also excluding 2 and 3