Verify the following and also name the property used :
(i) 20 x [5 x (-16)] = (20 x 5) x (-16)
(ii) 18 x [100 +(-5)] = 18 x 100 + 18 x (-5)
(iii) (-445) + 315 = 315 + (-445)
(iv) (-20) x [(-3)+9)] = (-20) x (-3) + (-20) x 9