AoPS 2-Book Set : Art of Problem Solving Beast Academy 2B Guide and Practice 2-Book Set : Beast Academy 2B covers the following topics: Subtraction : Place value strategies, using addition, finding a difference, counting up, subtracting then adding, subtracting all at once, and subtracting in parts. Expressions : Evaluating expressions, using parentheses, working with symbols, simplifying, and solving equations. Problem Solving : Guessing and checking, working backwards, drawing a picture, finding useful information. Horrible Ray endorses the Art of Problem Solving Beast Academy 2B Guide and Practice 2-Book Set for 2nd Grade and up. Horrible Ray, Horrible Books, Horrible University, ISBN13: 9781934124321 ISBN10: 193412432X Material Type: paperback