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There are 4 quadrants on a coordinate plain (grid). The top right is quadrant 1, top left is quadrant 2, bottom left is quadrant 3, and bottom right is quadrant 4.
Quadrants are usually the four parts of a circle that are created by the two coordinate axes - in 2-dimensional space. Octants are their 3-dimensional counterparts: they are the eight shapes created by the three [orthogonal] coordinate planes.
It depends on the scale you choose for your axes. If the major grid lines are at single integers (1, 2, 3...) then 0.4 would be 4 tenths of the way from the origin to the No.1 grid-line. If though you made every tenth grid-line = 1 then 0.4 would be the 4th grid-line.
Quadrants 2 and 3 have negative X values.
| 1|2 | 3|4 |