How many 500x250 roof slates per sq mt?

To calculate the number of 500mm x 250mm roof slates per square meter, first convert the dimensions to meters: 0.5m x 0.25m = 0.125 square meters per slate. Then, divide 1 square meter by the area of one slate: 1 / 0.125 = 8 slates. Therefore, you can fit 8 slates of this size per square meter.