Students love decoding secret messages and revealing pictures as they perform operations with signed numbers, add like terms, and perform distribution. The built-in feedback keeps them motivated as they first master addition, subtraction, multiplication, division, and various combinations with integers, and then later combine like terms and distribute. The four operations' rules become a breeze with three fun and easy-to-learn songs, including catchy "Minus, Minus Integers". The 20 puzzle sheets