Use five 5s to make 100?

To make 100 using five 5s, you can use the following equation: (5 + 5) x (5 + 5) + 5 = 100. This equation breaks down as follows: 10 x 10 + 5 = 100. By adding two fives to get 10, then multiplying them together to get 100, and finally adding the remaining five, you achieve the desired result.