dreimal
three times
Indicates the number of three repetitions or occurrences.
Ich habe dreimal geklopft, aber niemand hat die Tür geöffnet.
I knocked three times, but no one opened the door.

three times
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three times
Indicates the number of three repetitions or occurrences.
Ich habe dreimal geklopft, aber niemand hat die Tür geöffnet.
I knocked three times, but no one opened the door.

Number adverbs like 'dreimal' (three times) are formed by adding the ending '-mal' to a cardinal number. This pattern works for almost all numbers (e.g., 'einmal' (once), 'zweimal' (twice), 'zehnmal' (ten times)).
Ich habe dieses Lied heute schon fünfmal gehört.
I have already listened to this song five times today.
'Dreimal' (three times) can stand in position 1 to emphasize the frequency. Then the verb follows directly after it. It can also appear unstressed in the middle of the sentence.
Dreimal hat er die Prüfung versucht.
Three times he attempted the exam.
To express frequency, 'dreimal' (three times) is often combined with 'pro' (per) or a time expression in the accusative, for example 'dreimal pro Woche' (three times per week) or 'dreimal am Tag' (three times a day).
Man sollte dreimal am Tag die Zähne putzen.
You should brush your teeth three times a day.
The word is often used in comparisons to express a multiple. The structure is often 'dreimal so + adjective' (three times as + adjective).
Dieses Haus ist dreimal so teuer wie unsere Wohnung.
This house is three times as expensive as our apartment.
three
'drei' and 'dreimal' both contain the number 3, but they answer different questions. 'drei' says how many things, people, or units there are. 'dreimal' says how often something happens or is repeated. That is why you can say 'drei Termine' (three appointments), but 'dreimal anrufen' (to call three times). Learners confuse the words because the number is the same in both. A practical tip: If you can ask 'how many?', 'drei' usually fits. If you can ask 'how often?', 'dreimal' fits.

Nach dem Unterricht übt ihr den Dialog dreimal.
After class, you practice the dialogue three times.
Bei der Arbeit hat der Chef heute drei Termine.
At work, the boss has three appointments today.