Mathematical Reasoning E (Grade 4)

Level E is where math muscles really grow. Fourth graders explore equivalent fractions, improper fractions, factors, prime numbers, negative integers, and yes—inequalities and basic functions. It's serious content, but presented in a way that will keep your child feeling like he's solving riddles instead of slogging through worksheets. With topics aligned to national standards, the 384 pages spiral through previously learned content while tossing in new challenges to keep brains buzzing. Bonus: chart-reading, math language, and spatial reasoning get a major workout, too.