1) The document provides examples of solving problems by working backwards. It explains that some problems provide information in a sequence and ask you to find something that happened at the beginning. To solve these, you start at the end and work backwards through the information given. 2) An example problem asks what time Lucy should leave for the bus station if she wants to take a 4:45 bus, it takes 20 minutes to get there, and she wants to arrive 20 minutes early. Working backwards from the end time, the solution is that she should leave at 4:05. 3) The document provides practice problems and prompts students to use the four-step problem solving method and show their work. It includes problems about