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You may never have heard of modular arithmetic, but you use it every day without the slightest difficulty. In this system, numbers wrap around when they reach a certain size called the modulus; it ...
We use modular arithmetic all the time. It's useful for situations where you want to start over, time being the most obvious. Say it's 9 o'clock. ... So, for example [π]=3.
Sometimes it’s informally called clock arithmetic, because it’s like how we tell the time: When we get around to 12 we start again at 1, so that 13 is “the same as” 1, 14 is “the same as ...