Math Riddles

Question: What is 50% divided by 2?

Question: Name 4 ways to calculate 1+1.

Question: You need a room for your group. Each person needs 5 square feet of space. You have 25 people in your group, what is the smallest room you can use?

Question: What exponents other than the same two numbers with the numbers one thru ten can be flipped and have the same answer?

Question: If 1+1=2, 2+2=8, 3+3=18. What does 4+4=?