A valid question....I guess, if you're taking an academic test.
But in the real world flying jets...
210IAS for inital approach manuevers clean,
180IAS (intermediate flap) for intercept and manuevers final approach outside marker,
160IAS approaching marker (gear down/another flap)
APP+10 1000ft agl Final flaps
Never lose sight of the big picture...If you practice the ignorant art of "measuring with a micrometer", I can assure you .....you will lose your flying skills, your confidence, and your air sense.
For you new pilots.....Make sure that you place a good deal of common sense between theory and practice.