Spanish · Chapter 4 · Lesson 7 · Grammar primer
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On the AQA A-level grammar list.
The short version
Primero clips to primer, but only sometimes
Primero and tercero shorten to primer and tercer in front of a masculine singular noun, and nowhere else. So el primer día and el tercer piso, but la primera semana and la tercera calle keep the full form. With nothing following, the full form returns too: llegó primero.
el primer día
That's the gist. The full article goes deeper - more examples, the edge cases, the why - and the practice below scores like a vocabulary session and earns the same XP.
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10-question session
One question at a time, mixed across the exercises in this lesson. Miss one and it comes back round before the end. There are 14 in all: practise more afterwards if you want them.
Lesson 7 of 11 in this chapter