If you would like to divide 3 and 1/6/(-9), you can do it using the following steps:
3 / 1/6/(-9) = 3/1 / 1/6/(-9) = 3/1 * (-9)/1/6 = -27 / 1/6 = -27 * 6 = -162
The result you get is -162.
The answer to your question is “false”
0.45 = 45/100
45/100 = 9/20 (Simplified)
0.5
+0.3
---------
0.8
The answer is 8 tenths
