I had some questions and small discoveries.
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- I thought the trick is properly for any mod that among 1 through 9.
?? Is that right - When the number is smaller than the mod number, the remainder also can be negative numbers too.
- I thought the trick is properly for any mod that among 1 through 9.
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@sincereseagull This is a great observation!
There definitely exist negative remainders, and they are incredibly useful when we want to find the remainder of a product of numbers that are multiplied together. Prof. Loh covers negative remainders in Day 1 Challenge Part 7, Day 1 Your Turn Part 2, Day 3 Your Turn Part 3, and Day 4 Challenge Part 4. 
