Use numberlines and spreadsheet rules to explore the amazing patterns we find in our whole numbers. Did you know that you can get the odd numbers by subtracting the square numbers? I won’t give away any other secrets, but I know you will find in these patterns some wonders. And you may even construct your …
How should you figure out your profit? If you have an item that you are selling, should you price it at 25% over its cost to you, or should you price it so that your margin is 25%. Many people think that their profit will be the same either way. Is that true?
Which form of interest, simple or compound, is the fairest? If you were buying a house or a car which would you rather have, which would you consider fair? Or if you had your money in a bank account earning interest, which would you consider the fairest way to calculate that interest? We will show …
Create, manipulate, and explore triangles in this live interactive spreadsheet. On the surface, a triangle is being drawn on a graph, but the real magic lies in the formulas used to make this spreadsheet work.
In 1941, Joe DiMaggio got a hit in 56 straight games. This record has never been beaten. Some say it is the greatest record in all of sports. You can develop a simulation of DiMaggio’s streak to see why it is considered so difficult to beat. And you can decide for yourself whether you think …
