RightStart Mathematics Level B lessons continue to build a strong foundation with number sense activities that focus on quantity recognition and mental strategies by grouping in 5s and 10s. RS2 Level B teaches 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, with problem solving and place value emphasized throughout. This Right Start Level B Book Bundle includes: Right Start Level B Lessons, 2nd Edition, 284 pages, spiralbound Level B Appendix Page Yellow is the Sun book Level B Worksheets Book, spiralbound softcover, 2nd Edition Manipulatives (not included) are required. 2nd Edition.