The RS2 Level B Lessons continue to build a strong foundation with number sense through quantity recognition and mental strategies by grouping in 5s and 10s using the AL Abacus. RS2 Level B includes addition and subtraction facts to 18, place value to the thousands, geometry, measurement, time, money, and basic fractions. 4-digit addition and 2-digit mental addition is also incorporated. Problem solving and place value are emphasized throughout. Card games are included in the lessons. Review lessons are included for children new to the RightStart program.