My daughter doesn’t have a single physical textbook. There are some online textbooks. I found a cheap physical copy of her Spanish textbook (under $10 from amazon) that I purchased for home so she can look something up quickly or study without needing the computer. Many papers do end up on google classroom. For one math homework my daughter asked my husband to look at one problem. It seemed crazy to him too. There was a negative number that made no sense but when it was used as a positive number it was simple. It turned out that it was indeed supposed to be a positive number. It was surprising the teacher mention that ahead of time.
Math I just don’t really understand the lack of textbooks. I think the last time my 9th grader had any type of math book was in 2nd grade. I don’t even think she has an online math book. For kids (esp young grades) who benefit from parental help it can be hard to help when you don’t know how things are being taught today.