$16,\ 5,\ 0.5,-2$

$\frac{\text{1}}{2},\ 0,\ \sqrt{85},\ -8$

$-9,\ 2\sqrt{100},\ \sqrt{121},\ 18$

$42,\ 6.25,\ -21,\ \sqrt{4}$

$4,\ 8,\ 0,\ -2$

$\frac{1}{2},\ 7,\ 5.2,\ 3$

$\sqrt{11},\ 3\sqrt{100},\sqrt{4},\ \sqrt{8}$

$23,\ 0,\ 3,\ \sqrt{81}$