These activities fit into your regular curriculum, covering whole numbers, fractions, decimals, percents, and equation solving. PSM uses a guided discovery approach to solving problems in drill and practice, grade-level topics, and challenge activities. At least 100 pages of blackline masters per book plus teacher commentary with objectives, problem-solving skills, and answers. Alternative Problem Solving in Mathematics (grades 4-6) contains similar problems, but with scaled-down computation and completion times. (We encourage teachers to receive training in implementing this program. Please see the In-Service Guide.)