Students have been taught rules to subtract integers. This material has been aligned to national and state standards of California, Colorado, and New Mexico. Students use the additive inverse property while solving subtraction problems.
Students look for a pattern to develop algorithms for subtracting integers.
Review Teacher places positive and negative chips on the overhead matboard and asks the students to evaluate the value of the mat. Do a variety of combinations to make sure students understand that zero is made up of combining a positive and negative chip. Review how students record their steps. Introduce Subtraction Make sure students understand that in this model, subtraction means removing chips . Students should have their manipulatives and mat to do these problems with you as you model on the overhead.