This assessment focuses on your ability to use numbers in context. Counting is easy, but using them in cases is where the real skill lies.
The test includes the declension of 1-4 (tří, čtyřem, jedním) and recognizing large numbers like dvě stě (200) vs pět set (500).
Watch for prepositions like bez (Genitive) or s (Instrumental) which will force the number into its inflected form.