These books feature a menu of short, purposeful mini-lessons together with guided and independent practice at 3 levels that build student's competency in the following subject areas: Working with numbers and operations in base ten; Using four operations; addition, subtraction, multiplication and division; Understanding properties and patterns of algebra; gaining an understanding of and performing operations with fractions; taking measurements (time, weight, height, length, area, perimeter); engaging in computational skill with quantitative reasoning and problem solving skills to solve word problems.