Rules for Multiplying Positives and Negatives, Model 1

Rules for Multiplying Positives and Negatives, Model 1 is a Grade 7 concept lesson that explains integer multiplication through a real-world oil-tank model. Students connect positive and negative factors with time direction and gain or loss, using a leaking tank to reason about why a negative times a negative can produce a positive result. The context gives the sign rule a meaning beyond memorization.

Use it as a whole-class introduction when students are beginning integer multiplication. Walking through all four sign combinations before applying the oil-tank example helps students connect the model with the general rule. Create a free Find a Math Game account to generate teacher-ready lesson support for Model 1. No credit card, with 3 lifetime lesson generations.