Well, honey, you write 90 in short word form by simply saying "ninety." It's as easy as pie. No need to complicate things, just keep it short and sweet.
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Ninety
90 is an integer, not a fraction.
Ninety in standard form is 90
296
It is 3000000000 + 700000000 + 6000000 + 200000 + 40000 + 800 + 90 + 9.
It is: 2 times 3^2 times 5 = 90 no indices are needed for 2 and 5