90 is indirectly mentioned when referring to 99

18:25
وَلَبِثُوا فِي كَهْفِهِمْ ثَلاَثَ مِائَة ٍ سِنِينَ وَازْدَادُوا تِسْعا ً
Wa Labithū Fī Kahfihim Thalātha Miā'atin Sinīna Wa Azdādū Tis`āan 

And they remained in their cave for three hundred years, and increased by nine.