The half-cardinal points are also shown on this compass
North-East (NE) 045°, South East (SE) 135°,
South-West (SW) 225° and North-West (NW) 315°
The magnetic needle always points towards the North - so you have to line the compass up with this before you can use it.
If you were asked to walk on a bearing of 90°, you need to line up the compass with North and then turn 90° clockwise and then walk in that direction - which would be East.
To return to the original position you would need to turn 180° - so add 180° to 90°
and you get a new bearing of 270° - Line up the compass and turn 270° and then walk in that direction - which would be West.
Practice using bearings with these worksheets from Primary Resources
Directions Jack Sparrows Compass Compass Points
Compass Directions Mouse Hunt 1 Mouse Hunt 2
Mazes Treasure Map 1 Treasure Map 2