This link will help you make modular arithmetic calculations.
You should take a look at this
short exercise sheet on Semester II algebra material. These are the level of questions that you'll be expected to answer in the end of semester exam.
Lecture 1
Lecture 2
Lecture 3
Lecture 4
Lecture 5
Lecture 6
Lecture 7
Lecture 8
Lecture 9
Lecture 10
Lecture 11
Lecture 12
Lecture 13
Lecture 14 was a tutorial
Lecture 15 was a tutorial
Lecture 16
Lecture 17
Lecture 18
Lecture 19
See here for an explanation of how eigenvalues are used to determine the page rank of a web page in the Google search engine.
Lecture 20
Lecture 21
Lecture 22