Sam is in a fix. He has 9 distinct toffees which he has to distribute among his 8 sons in a way each son gets at least one toffee. In how many ways is this possible? Emma was born somewhere between ...

At the time of shipping, Tom can place 10 small boxes or 8 large boxes into a carton. A total of 96 boxes were sent in one shipment. The number of small boxes was less than large boxes. What is the ...

What started as a 50-point class project has become a published tool for changing how students think about mathematics.