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

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  • 1 decade ago
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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.

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  • 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.

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