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

1. A right triangle has one side of length 9 and another of length 5. What is the length of the hypotenuse?
2. What is the square root of 68?
3. What is 5 raised to the power of 2?
4. If a square has an area of 75 square units, what is the length of one side?
5. Find the value of: 20² + 9³

Challenge accepted!