It has been proven that children benefit immensely when parents take an active role in their education. Skill Sharpeners Math series provides the frequent, focused practice needed to help ensure mastery and retention of skills. The math skills practiced in the Skill Sharpeners Math series are based on the five strands of the National Council for Teachers of Mathematics (NCTM) standards: * number and operations * measurement * geometry * algebra * data analysis and probability Each book in Skill Sharpeners Math contains ten units of grade-appropriate practice to help your child understand and maintain important math skills. After every unit, there is an assessment that tests your child's understanding of the skills covered. Some questions are presented in standardized test format.