I have DD 12 and DS 9 both using LOF. We use it as our only math curriculum. Previously, we used Singapore. LOF is a breath of fresh air and my kids now LOVE math. DD did Fractions and Decimals in one semester which consisted of one lesson a day. She did the bridges until she got the required amount right to pass, sometimes 1, sometimes 3 tries :-) DS also does one chapter a day in the elementary series, and I believe we completed 4 books this year. He is going slower the farther we progress as the material gets harder. This was the 1st year we used Fred exclusively and his standardized test scores improved dramatically.