Name the operation you should perform first.
1. 4 x 6- 3
2. 1 + 8 ÷ 2
3. (2 + 5) - 4^2
4. 7 ÷ 7^3 x 7
5. 8^2 ÷ (8 - 4)^2
6. - 4 + 3^3 ÷ 5