Harry, you're moving to advanced math! Try these:

1. A right triangle has one side of length 9 and another of length 12. What is the length of the hypotenuse?
2. What is the square root of 87?
3. What is 4 raised to the power of 2?
4. If a square has an area of 200 square units, what is the length of one side?
5. Find the value of: 16² + 5³

Challenge accepted!