Math: More percentages and an easy calculator trick to find the cost of something. Need to figure out a 15% tip? Times the total cost by 1.15. Done. Need to know the cost of something if it is 30% off? Times the original price by .7 (.7 is the 70% of the cost you pay) Done.
When I was growing up, teachers used to say, "You'll never have a calculator in your pocket." Funniest irony in education history. Let's teach kids how to use this tool that they literally carry with them everywhere.
Science: Biology Videos summaries by A1...







