We've used Key to... for fractions, decimals and metric measurement. They are excellent teaching books. They work for kids, like my DS10, who need a progressive, logical and systematic teaching style that moves in small increments. I wouldn't use them for review (it'd be painful), but they are brilliant if your child needs to really learn a concept. Because we're Australians using an American syllabus (Christopherus - we're Steinerites) I've found breaking maths into distinct subjects (fractions, decimals, measurement, etc) really difficult to work with. We don't do that here! While my son has learned the material well, he really needs more review. So we're leaving Key to... for Making Math Meaningful (Jamie York - another Steiner curriculum) and Life of Fred. My son isn't so keen - he loves Key to... and he isn't mathy. LOF is the sweetener - its a big hit here. Making Math Meaningful has weekly review, but I'm going to have to work harder because its much less open and go in the learning phases than Key to.... I actually think this will be good for us. I taught maths more actively in his younger grades when I didn't have work books to cater to my innate laziness (not saying anyone else is lazy if they use workbooks, just that I know I am and I only have one kid to teach!) HTH D

I have a science degree and worked as both a lab-based scientist, and an epidemiologist and scientific writer for 17 years. I think her products are outstanding. I have watered down her Botany sample for my DS10 because I thought it was too much (I wanted him to appreciate the wonder of botany before getting caught up in the science). He loved the stuff we did (especially making a latin species name for the dog) and we'll revisit the level 2 work in a couple of years. I can't wait to do cells. Ellen was great to deal with. She even sent me a refund because I was overcharged shipping. D