Ninety. To go up from that, use a hyphen. (Ninety-one, ninety-two...)
Ones place
It is 90.
90-day limited manufacturer's warranty...?
It is 90 = ninety
It's 'a 90 days' supply'.
0.900
90 0F is 32,2 0C; it is a temperature for a summer day, a hot day.
There are 1440 minutes in a day. 90/1440 = 0.0625 = 6.25%
You can write 90 in short word form as ninety.
90 days
87 to the nearest tens place is 90.