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9128 – 5595 = 3533
D.S Method Not working for this
9128 = 2
5595 = 6
2-6 = -4 ??
Hi Harsh,
Thank you for asking this question and I am not sure how I missed adding this in the lecture. When the subtraction of the DS is negative you add 9 to the negative number.
21 – 14 = 7
3 – 5 = -2 (+9) = 7.
Another example
24 – 7 = 17
6 – 7 = -1 (+9) = 8 (Which is the digit sum of 17 = 1 + 7 = 8)
For your particular problem
9128 – 5595 = 3533
2 – 6 = -4 (+9) = 5 (Which is the digit sum of 3533 = 5)
Thank you for asking this question. Will update the lecture so its more clear. 🙂
Hope this clarifies.
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