5th through 9th grade. This is the third book in the Life of Fred Pre-Algebra Set . Complete Fractions and Decimals and Percents first. Fred does physics before algebra. In Life of Fred: Pre-Algebra 0 with Physics you’ll learn . . . How ducks and cows pronounce µ differently Why no one can weigh 55 kilograms How Kingie Sonlight resource: https://www.sonlight.com/products/life-of-fred-pre-algebra-0-with-physics