This fun, mind-building book features 3 types of puzzles that focus on addition and subtraction of whole numbers. Puzzles also sharpen critical thinking, computational and algebraic reasoning skills. Balance puzzles require students to analyze balances to deduce the missing value. Inside-out puzzles require students to reverse their thinking, using the inverse relationships between addition and subtraction and multiplication and division to solve the puzzle. Tic tac puzzles require students to figure out the correct order to complete all rows, columns and diagonals. Spiraling difficulty is designed to scaffold a student's conceptual understanding of the targeted operations. Includes teaching suggestions and detailed solutions. Reproducible paperback has 48 pages. For grades 2-5.