1. Difficult: The most difficult part for me to understand was division in modular arithmetic. I've gotten really good at addition, subtraction, and multiplication but I have never really used division. There is just a lot more that goes into division than addition, subtraction, and multiplication.
2. Reflective: I have used a lot of modular arithmetic when I took computer science winter semester. We used it mainly when we had different choices and needed one at random. We would produce a random number and then mod it depending on how many choices there where. Modular arithmetic can make center things so much easier.
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