The number 90 is written out in words as such: ninety. You should spell out a number rather than write it in number form in particular scenarios, such as if you are beginning a sentence with a number.
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In number, '90,000' In Words ' Ninety thousand'.
90 x 106 or 90,000,000
90%, 9/10, 90/100 :D
The symbols are: 60 > < 90
.09