a) –1.72, 0.71, -1.71, 0.715, -1.690, 0.695, -1.2, 0.23
0.715 > 0.71 > 0.695 > 0.23 > -1.2 > -1.690 > -1.71 > -1.72

b) 0.001, -0.001, 0.0011, -0.00111, 0.00011, 0.11, -0.01
0.11 > 0.0011 > 0.001 > 0.00011 > -0.0011 > -0.00111 > -0.01