How to calculate 18.9x178.178 + 0.49-17.8x189.189?

How to calculate 18.9x178.178 + 0.49-17.8x189.189?


18.9x178.178+0.49-17.8x189.189
=18.9*178*1.001+0.49-17.8*189*1.001
=18.9*17.8*10*1.001+0.49-17.8*18.9*10*1.001
=0.49