Subject: Double negatives
Date: Mon, 02 Dec 1996 20:43:44 -0800
From: Melanie Reid
Help! My child is in Grade 7 and I need a way to explain to her why (-2)x(-2)=4. She understands the rule behind it that 2 negatives always cancel each other out but not why. What she wants a some way to picture it in her head. There must be someone out there much smarter than I who can figure this out.