Dan Brown's The Da Vinci Code is filled with secrets. Help readers find the clues, solve the riddles and puzzles, and unwrap the mysteries with a six-page guide that includes before, during, and after reading discussion questions and...

Students solve linear equations and identify the unknown. In this algebra lesson, students define a variable and use addition, subtraction, multiplication and division to solve. They change the equation depending on the value of the...

Students use the zero principle to add integers. In this algebra lesson, students add positive and negative integers verifying the zero principle. They use manipulatives to help them see how opposites can cancel each other out.