While that’s a frustrating fact of life in general, it does make for some fun brainteasers! Take this “how many squares” ...

The number 9 can be written as a difference of two squares as 3 2 – 0 2 = 9 – 0 = 9. Can you find a different way to express it as the difference of two squares? Which numbers between 1 and 30 can be ...