Videos:

https://www.youtube.com/watch?v=qmfXyR7Z6Lk&t=215s&ab_channel=mathantics (multiplying fractions)

https://www.youtube.com/watch?v=LVOqam0z6ZI&ab_channel=MathwithMr.J (multiplying mixed numbers)

https://www.youtube.com/watch?v=wYK0X8XvJjE&ab_channel=TheOrganicChemistryTutor (multiplying algebraic fractions)