The greatest number among following : $$0.7 + \sqrt {0.16} ,$$   $$1.02 - \frac{{0.6}}{{24}},$$   $$1.2 \times 0.83,$$   and $$\sqrt {1.44} $$

$$\eqalign{ & {\text{0}}{\text{.7 + }}\sqrt {0.16} = 0.7 + 0.4 \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = 1.1 \cr & 1.02 - \frac{{0.6}}{{24}} = 1.02 - 0.025 \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = 0.995 \cr & 1.2 \times 0.83 = 0.996 \cr & \sqrt {1.44} = \sqrt {\frac{{144}}{{100}}} \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\, = \frac{{12}}{{10}} \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = 1.2 \cr & {\text{ So }}\sqrt {1.44} {\text{ is the greatest}}{\text{.}} \cr} $$