The price of a metro ticket is 1,50 €.
However, there is a package called "Metrobùs" (10 tickets), valid for several people at the price of 12€ (but it will be necessary to add 3 € for an itinarary airport / city center).
You can also use bus lines and "cercanìas" to visit Toledo, Segovia and Aranjuez.
Destination
Get around in Madrid
Here some of the tips you need to move around in Madrid