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

2 Answers

Relevance
  • 1 decade ago
    Favorite Answer

    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.

  • 1 decade ago

    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.

Still have questions? Get your answers by asking now.