Positive and Negative Integers Coded message activity (7.NS.A.1c.) is a fun way to review operations with positive and negative integers. Students solve problems including adding, subtracting, dividing, and multiplying to finish a code of letters and then use the code to find a message. Two different messages and codes are included in this set. This is appropriate for students new to positive and negative integers. ANSWER KEY INCLUDED. NOTE: There are not problems for all 26 letters. Each