This paper is concerned with an intuitive contrast that arises when we consider sentences containing empty definite descriptions. A sentence like 'The king of France is bald' appears neither true nor ...

Count forwards and backwards in eights using this counting stick. If we know the answer to a multiplication number sentence or multiplication fact we can work out the answer to an unknown number ...

Subtraction is taking away one number from another. When you subtract it gives you the difference between two numbers. Here are 7 blocks. If you take away three blocks, how many are left? There would ...