Children from 8th were learning algebra and had difficulties with the sign operations. They were able to come up with stories of multiplying minus into plus, plus into minus and plus into plus but they couldn’t come up with a story of minus into minus. They asked the volunteers and facilitators to tell a story for it but they couldn’t get the right story for it. Sanjeev gave a story and explained how negative value multiplied with negative value becomes positive. Children even tried the story on the staircase. They closed their eyes and walked backward (negative) and facing down the staircase (negative) and when they opened their eyes they saw themselves climbed few steps up(Positive). They were excited and were able to implement it on their algebraic equations. They had fun while learning it.
Scratch program that randomly takes two numbers and does the same story.
link to scratch code: https://scratch.mit.edu/projects/296602417/