There is a square living room with a side length of 4 m, which is covered with regular triangular tiles with a side length of 50 cm. How many tiles do you need?

There is a square living room with a side length of 4 m, which is covered with regular triangular tiles with a side length of 50 cm. How many tiles do you need?

50cm=0.5m
0.5*0.5=0.25
4*4=16
16\0.25=64