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Algebra > Difference of two squares

##### Age 14 to 16 Challenge Level:

Take any prime number greater than 3 , square it and subtract one.
Working on the building blocks will help you to explain what is
special about your results.

##### Age 14 to 16 Challenge Level:

Many numbers can be expressed as the difference of two perfect squares. What do you notice about the numbers you CANNOT make?

##### Age 14 to 16 Challenge Level:

Can you explain the surprising results Jo found when she calculated
the difference between square numbers?

##### Age 14 to 16 Challenge Level:

A 2-Digit number is squared. When this 2-digit number is reversed
and squared, the difference between the squares is also a square.
What is the 2-digit number?

##### Age 16 to 18 Challenge Level:

By proving these particular identities, prove the existence of general cases.

##### Age 11 to 14 Challenge Level:

A man paved a square courtyard and then decided that it was too
small. He took up the tiles, bought 100 more and used them to pave
another square courtyard. How many tiles did he use altogether?