This is a set of math facts that I use with my sixth grade students. They include common addition, subtraction, multiplication, and division problems. Also included are decimals, percents, and fractions. All problems are designed to be done mentally. By the end of the year, I require my students to be able to pass these math facts (with 95% accuracy) within five minutes. With mental math being a strong component of Common Core, these math facts fit the bill. Included are four versions of the same math facts, as well as a study guide for students.