This is a 42 page Smartboard lesson on how to write algebraic expressions. The lesson starts out by learning the language. There is some matching of words to the operations they describe. The lesson proceeds to writing basic expression. After several practice pages the lesson progresses to more complicated expressions. By the end of the lesson students should be able to not only write expressions they will also be able to solve the ones that turn into equations. There are plenty of practice pages and they all include the answers.