Difficult: It was a little difficult at first for me to understand how exactly addition and multiplication worked in congruence classes. I was confused by the use of 4 integers a, b, c, and d in Theorem 2.6 and its proof, and then only 2 integers in subsequent examples. However, I think I was probably just overthinking it and I understand how they both work now.
Reflective: I think it is really interesting that Zn is so closely related to Z. Also, it's interesting that there is a way to add and multiply congruence classes, and I hope that we will be able to do more work with these in the future so that we can find out how to apply congruence class addition and multiplication.
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