Cube Root in 3 seconds - Crazy Math Trick

How to Calculate Faster than a Calculator - Mental Math #1

Cube Root in 3 seconds - Crazy Math Trick | Square Root in 3 seconds - Crazy Math Trick | Math Olympiad | Harvard University Entrance Exam Interview | This question frightened 300K+ examinees! | Hard Geometry Exam Question | Only 1% of Students Got this Math Question Correct

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[brain_station_videos]

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[ravipramod]

Your method of calculation square roots for perfect squares in seconds has significantly helped me calculate the square root of the discriminant in the quadratic formula for solving quadratic equations in my math exams. I've shared your method with my teachers and they were impressed 😊

[holyshit]

Maybe it would be better to explain paper and pencil way of taking cube root
(10a+b)^3 = 1000a^3+300a^2b+30ab^2+b^3
(10a+b)^3 -1000a^3 = 300a^2b+30ab^2+b^3
(10a+b)^3 -1000a^3 = (300a^2 + 30ab + b^2)b
(10a+b)^3 -1000a^3 = ((300a^2 + b^2) + 30ab)b
1. So we divide number into three digit groups starting from decimal point and going in both directions
2.Choose digit such that difference between number created from three digits of leftmost group and cube of chosen digit is as close to zero as possible but non-negative
3. Let call this difference remainder
4. Append to the remainder next three digit group
5. On the side calculate following number
(triple square of current approximation and append to it square of last digit of next approximation then add to it
tripled product od current approximation and last digit of next approximation shifted one position to the left
then multiply number on the side by last digit of next approximation)
6. Subtract number created on the side from current remainder
7. Repeat steps 4-6 until we have zero remainder and no further groups of digits left or we achieved sufficient approximation

[SSS_]

You can't imagine how much you are helping me with maths!!!♥️
Thank you so much sir 🙏🏻

[meme_for_fun]

Your methods have helped very much in my past tests and assignments, I can now perform these square and cube roots without any problem 🎉🎉 so once again thank you

[qcikbyv]

I think that lightning cube root of 3 digit numbers is significantly easier than 2 digit numbers because the units digits of 1-digit number cubed are different, not duplicating like in 2-digit numbers.

[maxieweliethemathter]

The only downside to this is that you have to know for a fact that it's a perfect cube, and it might be impossible to prove that without knowing the answer or memorizing every perfect cube (at least, to my knowledge, i could be wrong, so feel free to correct me)

[浅月流歌]

Oh wow! I never knew you could do it like that! This helped so much! Thank you!

[Mathedge]

It's a vedic trick & also it is there 8th standard text book.nice explanation.

[CiaoSonoSimonSmoke]

∛250, 047=we Need tò find cubed Number that ends with 7 3³=27 so we put 3 and cancel three digits the closest cubed Number so 6³=216 and we write 6 and there you go ! The answer Is 63....
!"what about me?"

Factorials(!) or exclamation marks in maths Is very Easy so you take a Number like 6 then we put an exclamation mark After so 6! Then you Need tò multiply the digits that come before that Number so 6!=6×5×4×3×2×1=720
Easy!

[selcukalpdai]

The last question's answer is 63. Thank you very much very good information.

[sr.gustav]

I though this was just for some cases, that is awesome

[temkaDavka]

i subbed ur chanell ❤❤❤ make the more videos like this

[Need_Pillow]

Wowzers, thank you sir the answer is 63

[radhikatr]

How to find a no.is perfect cube or not then we can use this method

[JustRagic]

I have find out a formula of inscribed polygon perimeter. The formula is {n×2r×sin(θ/2)}/10

[ganeshrenka]

Only works for perfect cubes not for imperfect

[Pratik_]

Sir √853.59 (or any other value)
For this any trick ?

[sarthak_g_offical]

This trick is in our 8th maths book 😊😊

[Notthegoldenratio]

Its 63, almost thought it was 53 because i forgot 6^3 was 216