What is "METHOD of 9" in maths? What is it used for & how?

Answer 1

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Add the digits of a number together. Keep doing it until you get one digit. If the digit is 9 then the original number is divisible by 9.

Answer 2

To find the sum of all the digits in a number and its number and its number, so on, its easy.

Just count the digits that make it 9 and leave it aside. the answer will be the rest.

eg: 468195 = 4+6+8+1+9+5

4 + 5 = 9 leave it remaining is 6+8+1+9

8 + 1 = 9 leave it remaining is 6 + 9

* leave 9 remaining is 6

check if its correct

4+6+8+1+9+5

= 33

* 3+3 = 6

other than that there are magic tricks on mathematics using 9

tell ur friend to write a number. eg: 5248

You write a 2 to its left and reduce two from the number.

it will be 25248 - 2

= 25246 (write this on a paper and fold it and give to ur friend dont let her open)

tell her to give another number eg. 4639.

write this below the previous no.

5248+

4639+

Subtract each of the nos.4,6,3,9 from 9 i.e. {9-4 9-6 9-3 9-9}= 5 3 6 0) and write 5360 below the two nos.

it will be:

5248+

4639+

5360

let ur friend say another no. say 7261

u hav to substract those nos. by 9

(9-7 9-2 9-6 9-1) = 2738 and write it below.

so the whole thing will look like

5248+ (ur friend gave)

4639+ (ur friend gave)

5360+ (u wrote it)

7261+ (ur friend gave)

2738 (u wrote it)

25246

now tell her to open the folded paper and see...u found the result long before.

ITS FOR THOSE WHO DONT KNOW THIS TRICK.