A couple of everyday things are temperatures... ours, here in the U.S. are Farenheit, but it doesn't really matter... anything below 0 degrees F are measured in negative numbers... i.e., -5 degrees F is 5 degrees below 0 (zero). Additionally, how about negative altitudes, such as the Dead Sea being about 1,000 feet below sea level, making it a negative number. Others could be to do with money. I'm short $5 (or pounds, as the case may be) overdrawn at the Bank... certainly a negative number... Good luck!