The learning task is aligned to the 7th grade math Common Core Standard 7.NS.A.1a, which states "describe situations in which opposite quantities combine to make 0". The file is intended to be used as a slide show presentation displayed through a projector, however you could also print the pages you desire to use.
WARM UP - The warm up gives students 4 problems to solve, all in which equal zero. Students are then asked to explain the connection, hopefully stating that when you add opposite numbers the result is zero.
TASK - The task asks students to create a real world situation in which opposites combine to make zero. The task also includes an example, which could be shown to students so that they better understand the assignment.
MINGLE, PAIR, SHARE - Lastly, there is a closure activity, in which students will walk around the room and share with their peers what they have created. Depending on the time constraints of your class, this activity may need to be completed the following day.