Students learn to add a strings of multiple integers by sorting sets of positives and negatives and identifying opposites that cancel to zero.
After a mental warm up, the lesson uses the context of a credit card bill to classify numbers as either positive or negative, and then layered with creating opposites to speed up the process.
Since the credit card example relies on an addition model, the concept is then applied to subtraction, employing the rewriting method where subtraction is written as the addition of the opposite. The concept is then practiced with by the substitution of variables, finding a missing number, and finally to temperature word problems.
About the 3 TIERS MATH model:
We have analyzed and targeted the known struggles for this topic by scaffolding the lesson in 3 differentiated versions: Independent, Hints, and Guided. Word banks, answer keys, sentence starters, templates, hints, problem chunking and other strategies are used to provide a means for less confident students access the same curriculum and rigor, allowing all students to engage in one common learning experience.
This lesson is designed for students to work through in pairs or groups to discover the big ideas through guided inquiry. While some direct instruction is required, the structure empower students to be independent learners, where your role transitions to more of a mentor than teacher. It is the fourth lesson in the Neutralizing Negatives Unit for a 7th grade Common Core math class. There is a different lesson that is geared toward a 7th grade Accelerated Math class (not included).