Dealing with rounding As noted in the introduction, rounding can be rephrased as a problem in modular arithmetic. Using the example of rounding to the nearest hundred, it can be written like this: ...

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 ...

One of my fellow contributors here recently wrote a post about leap years and why we have them. This reminded me of modular arithmetic and the formula for calculating the day of the week for any ...