Based on Ray's New Intellectual Arithmetic, this series is recommended for Grade 4. Topics include: review of addition, subtraction, multiplication, and division facts with applications to more difficult problems; finding least common denominators for addition and subtraction of fractions; extensive work with story problems with lesson assignments from Ray’s Intellectual Arithmetic; adding, subtracting, multiplying, and dividing fractions; and ratios.

Uses Ray's Intellectual Arithmetic. The Key to the Primary, Intellectual, and Practical is also recommended. The Parent-Teacher Guide is optional.