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 Dec 26 comment On “familiarity” (or How to avoid “going down the Math Rabbit Hole”?) I have always wanted to learn discrete maths. I have tried with both text books and web pages. Each time I get stuck at 2 things 1. The mathematical hole the OP talks about 2. Mathematical symbols. Dec 5 awarded Editor Dec 5 revised Calculate remaining quantity based on half-life with everyday supplementation deleted 3 characters in body Dec 5 asked Calculate remaining quantity based on half-life with everyday supplementation Jul 18 awarded Supporter Oct 27 awarded Scholar Oct 27 accepted Sum of the digits of a numbers Oct 24 comment Sum of the digits of a numbers Yes, but I didn't say the answer is always 3. I said the answer is the same irrespective of what manner you add a particular number up - check the 3 different ways of adding up in the 3 examples in my question. Oct 24 comment Sum of the digits of a numbers I didn't say that the answer is always 3. Oct 24 comment Sum of the digits of a numbers @Arthur Upto stripping away the three 0-s is fine. But why does carrying out the addition 987 + 654 = 1641 not change the remainder modulo 9? Oct 24 comment Sum of the digits of a numbers I understand that the final answer answer for sumofdigits is always sumofdigits modulo 9. That's not my question. My question is why I get the same answer even if I go about summing different subsets of digits and then again summing them together - not sure how to describe this best - but my examples are there in my question Oct 24 awarded Student Oct 24 asked Sum of the digits of a numbers