I am currently teaching special classes to students whose ages range from 11 to 15 and there is quite a wide spectrum in their levels of maths. The lessons are given in English and we do not have a book to adhere to. Right now, I want to start the chapter on Decimals, having already covered fractions (in particular, limited to integer quotients and the 4 basic operations). Now I can nicely conceptualize decimal expansion using their understanding of fractions.
I was wondering, if there exist publicly available resources, such as textbooks or notes specifically on decimals, that I could print for the students, which would become our guiding manuscript and a constant source of exercises (important for the ones who want to advance further and I'm always behind in composing new series of exercises for them).
In terms of online resources available and not bound to copyrights, are there textbooks (exercise handbooks,..) or dedicated source of exercises on Decimals (expansion, 4 operations,...)?
Similarly, are there well-known sources for printable exercises on fractions?
I write about this without any reservation, meaning I understand there is not going to be something out there that exactly matches what I am looking for and that I might have to put various resources together to complement my courses. That said, any resources you know of that apply to my examples would be most welcome.