Here's how you do cube roots in your head! Avoid looking like Education Secretary Nicky Morgan who was stumped when asked to do a cube root: https://www.youtube.com/watch?v=x8CV0dfQMdU
Note: the starting number needs to be a perfect cube. So it's more of a magic trick: ask someone to cube a number and then you can deduce their original number quickly.
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Can you multiply 97 by 96 in your head? Or can you figure out the day of the week when you are given a date? This book is a collection of methods that will help you solve math problems in your head and make you look like a genius. "The Best Mental Math Tricks" (rated 4.7/5 stars on 4 reviews)
Arthur Benjamin is a Professor at Harvey Mudd College and well-known for feats of mental calculation. He explains the cube root algorithm in this pdf
This trick is really old--here's a newspaper article from 1913 that explains the trick!
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In the second example, you took the number 636,056. The number 636 is actually closer to 729. This is because 636 - 512 = 124. Where as 729 - 636 = 93. So according to your expanation, the answer must be 96 right? And even in the third case, 185 is actually nearer to 216 than 125. So I think you must mention something like this - '' YOU CHOOSE A CUBE NUMBER WHICH IS CLOSER AND AS WELL AS SMALLER THAN THE NUMBER YOU HAVE. FOR EXAMPLE, IF WE CONSIDER 185,193 , ''125'' IS CLOSER AND SMALLER THAN 185. ''
method is easy but it has some limitations.. difficult to find out exact cube roots of imperfect cubes and decimal numbers with this trick....#MindYourDecisions pls make some trick for decimal and imperfect cube numbers..
+kils meh OK retard let me make it easy for you
A number multiplied by itself once
5x5 = 25, that's a square
A number multiplied by itself twice
5x5x5 = 125 that's a cube
A number multiplied by itself three times
5x5x5x5 = 625 that's 4th power
The great thing about your channel apart from showing how cool, fun and fascinating math is, is that millions of people take a genuine interest in this subject as well. I think that bodes well for the future of humanity because math is essential to the STEM fields and ofc scientists and engineers are needed to advance technology and human civilization.
Wrong, trick failed by you.
In 2nd Example the number 636 is closer to the cube of 9 not 8, here your trick fails. So, its not the universal trick for finding cube root of any number. You just chose the ideal numbers for solving Examples.
Na, it actually does work out :) The last number of 195.122 is "2" and as said in the video 2 & 8 and 3 & 7 are to be switched places to get the first digit.. Hence you get the first number "8". Then you provide to erasing the last three digits after which you get 195. 195 is (without going over) closest to 125 which leads to "5" as our second digit --> cube root 58
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