-1 1/2 * 1 2/3

$$-1\frac{1}{2} \cdot 1\frac{2}{3} = -\frac{3}{2} \cdot \frac{5}{3} = -\frac{15}{6} = -2\frac{3}{6} = -2 \frac{1}{2} = -2,5$$