Mott Media has republished the Ray's Arithmetic from the late 1870's and early 1880's. This book includes philosophical understandings; principles and properties of numbers; and advanced study of common and decimal fractions, measurements, ratio, proportion, percentage, powers and roots, series, business math, geometry. Has challenging work for advanced students and basic work for slower students. Can be used in grades 7 and 8 as well as for high school.
This is a great book for simplifying early maths. I know, I know. You could do with any old textbook, but I wasn't inspired by a method of teaching with them, and when the kids don't get it, you need to find something else. This helped me return to a simpler way of describing things, a few activities that show, not tell, the kids why things work the way they do, and really get back to the roots of math.