I had to purchase this book because as a young student I wasn’t really good at math, so in my twenties I thought this math book would help and of course it did! Which I’m loving but my only question is why are some of the answers wrong; I have a web math calculator on a website and it’s the correct way but the book answers is different! So when you purchase this book yes it’s great but be aware of some wrong answers or ask look up the problem on google or even ask for help🤣!