Questions & Answers about У меня есть девяносто три рубля.
Why is rubles written as рубля (genitive singular) when 93 is a plural amount?
In Russian, the last word of a compound number decides the case of the noun. Because 93 ends in три (three), you follow the rule for the number 3: it takes the genitive singular (рубля). If the amount was 95 (девяносто пять), you would use the genitive plural (рублей).
Does девяносто follow a pattern, or is it an exception? I expected it to end in -десят like 50 or 60.
It is an exception! While 50 through 80 end in -десят (which literally means "tens"), 40 (сорок) and 90 (девяносто) have their own unique forms. You just have to memorize them as special cases.
Do I need to change три to match the gender of рубль?
No, the number три (3) is the same for masculine, feminine, and neuter nouns. Only the numbers 1 (один / одна / одно) and 2 (два / две) change to match the noun's gender. For example, if you had 92 rubles, you would use the masculine form of two: девяносто два рубля.
Could I leave out есть and just say У меня девяносто три рубля?