Please solve these 5 problems, I have 5 left to do after this.

Here are the calculations:

1. $2 \times 2 \times 2 = \boxed{8}$
2. $5^2 = 5 \times 5 = \boxed{25}$
3. $\sqrt{121} = \boxed{11}$
4. $\sqrt[3]{125} = \boxed{5}$
5. $4^3 = 4 \times 4 \times 4 = \boxed{64}$