Adding, multiplying, dividing fractions (2:53 in video)
Arithmetic with square roots (4:54 in video)
Addition of square roots using Indian method in Chapter 7 (5:50 in video) - This will not be on the test, since we didn't cover Chapter 7 this semester. But I haven't updated the video.
Working with zero (6:38 in video)
Euclid's proof af the infinitude of the primes (Primes Proof) - be sure to memorize this proof.