Taxi fares in Egypt are among the cheapest in the world. Each of the trips will cost you around EGP 40 each which is around $ 2.5. The trick is always you have to order a taxi while walking and a bit away from the sightseeing you are visiting.
Is taxi expensive in Cairo?
Taxis are really inexpensive in Cairo, if you can get a fair price. For the 3 routes you asked about, they should be less than 30 Egyptian pounds each (so less than £2 or $2). And, you would expect to pay a bit more do you're stuck in heavy traffic.