Reply To: Week 2 Video Lessons

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#28186

Hi Satya,

Even though digit sum checking doesn’t spot the error all the time, it is very handy. I have taught this to my 10 year old son. It has spotted errors many times especially in 4 digit by 4 digit multiplications. As 4 digit by 4 digit multiplication is not easy to verify answers using inverse (division) operation.

Thanks.

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