Learn Turkish: Sepette yaklaşık beş altı zehirli mantar var. - There are approximately five or six poisonous mushrooms in the basket.

In Turkish, placing two consecutive numbers next to each other, like beş altı (five six), naturally translates to "five or six." You do not need to add veya or ya da (or) between them to show approximation.

Does using both yaklaşık and beş altı sound redundant in Turkish?

While "approximately five or six" might feel a bit repetitive, it is perfectly natural and common in Turkish. Yaklaşık emphasizes that you are making an estimate, while beş altı gives the rough numerical range. You could drop yaklaşık, but using both sounds very conversational.

Since there is more than one mushroom, why is the word mantar not pluralized as mantarlar?

This is a fundamental Turkish rule you might remember: whenever a noun is preceded by a number or numerical quantity (even an estimated one like beş altı), the noun itself must stay singular. Therefore, it is always beş altı mantar.

How is the adjective zehirli formed here?

It is built from the noun zehir (poison). The suffix -li means "with," "having," or "containing." By adding it to zehir, you create the adjective zehirli, which literally means "having poison" or "poisonous."