Memoria Math Challenge Student Drills provides your young student with the daily practice and repetition needed to achieve mastery of basic arithmetic skills. Timed drills help students practice speed and accuracy so you can measure your child’s immediate recall. Level B covers addition and subtraction speed drills from 0 to 10 and is organized in an easy-to-use loose leaf format. If math facts are mastered in the primary years, your student can devote more time to complex math operations when they take more advanced mathematics courses. 352 pages, loose-leaf format. Grades K and up.