DS method check on page 17 of the book

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  • #46436
    Gaberila Shufani
    Participant
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    In regards to the DS method, in the book ‘Mental math tricks: to become a human calculator the Calculation 16.1 /7 = 2.3

    checking it with the DS method, does not add up to me. The digit sum is 8/7 = 5 however 8/7 does not equal 5 it equals 1.14285714286 adding that altogether is 4 not 5. Please explain it is on page 17 of the book.

    #46439
    Abhishek R
    Keymaster
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    Hi Gaberila.

    Don’t apply the DS method on the division 8/7 = 5.

    Instead move the denominator to the right of the equation:

    8/7 = 5

    8 = 5 x 7

    8 = 35

    8 = 3+5

    8 = 8

    Hope this helps and answers your question.

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