Here's how to convert the dimensions of the aluminum block from meters to centimeters:

* 1 meter = 100 centimeters

So, the dimensions in centimeters are:

* Length: 1 meter * 100 centimeters/meter = 100 centimeters

* Width: 2 meters * 100 centimeters/meter = 200 centimeters

* Height: 3 meters * 100 centimeters/meter = 300 centimeters

Therefore, the aluminum block is 100 cm x 200 cm x 300 cm.