Remainder Trick When Divided By 9

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[anshikarana]

Wow never liked maths but this got me interested

[BG-cnlh]

Divisibility rules :

- A number is divided by 2 if the last digit is even.

- A number is divided by 3 if the sum of its digits is divisible by 3

- A number is divided by 4 if the number represented by its last two digits is divisible by 4

- A number is divided by 5 if the last digit is 0 or 5

- A number is divided by 6 if the number is divisible by 2 and 3

- A number is divided by 7 : Remove the last digit, double it, subtract it from the leftover number. The result is divisible by 7

- A number is divided by 8 if the number represented by its last three digits is divisible by 8

- A number is divided by 9 if the sum of its digits is divisible by 9

- A number is divided by 10 if the last digit is 0

- A number is divided by 11 : subtract the last digit from the number formed by the remaining digits. If the new number is divisible by 11, the original number is divisible by 11.

- A number is divided by 12 if the number is divisible by 3 and 4

[vladof_putler]

I knew this trick because you check if a number us divisible by nine by adding all the digits

[nemono-won]

Does this trick work with any numbwr you divide by ?

[Sidhhaa]

The simple way is add all the numbers and divide by 9 you get the quotient. Total Comes to 50 divide it by 9 you get the balance 5, how is this?

[lornelthaltmer]

this trik is neat but its useless when asked to explain how you came to the answer; even more so when you have to write out the equation.

[nived]

Teaching situational rules like this is the bread and butter of common core, and it ends up being useless.

[mecaomega]

😂 i love math and stopped some time ago. This is slowly returning me to it.

[why]

You added tricks which will entertain students and kids... When kids love to play and slowly will love to solve mystery... Unlike teachers in school....

[chorlers]

you just add up all the individual numbers 7+3+5+2+2+4+7+9+2+9..and get 50 and repeat... 5+0 = 5

[aritrakhan]

Sum of each digit in that number is 50, 45 is the closest multiple to 50 which is lower than 50.so 50-45=5

[drarunaj]

Add all the digits....Its 50.
Divide 50 by 9.
5 remains.

[chucks]

His system is shot full of holes. I tried eight different random high number divisions and only one came close to the remainder. VooDoo arithmetic!!

[sarahfarrell]

I said 5 first, but thought I was wrong, ugh, always go with your 1st answer

[sanjay]

Is it only for division by 9 or with any number?

[gauravwadhera]

Wah Ustaad ji Wah...Aur bhi example share kijiye for different multiples other than 9

[still__twenneclicc]

But if u do the 9 trick going right to left u end up with 3

[sachmo]

What if the divisor is double digits or more?

[cuyoung]

What a way to do math, why isn’t this the way they teach??.. so less stressful!!!..

[suriyayugi]

Is this possible for oppert for 9 .loke 6 5