900
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It is: 1/9 of 90 = 10
1/10 of 90 is 9
10% of 90 is 9, which as a fraction is: 9/1
-99
90 can be written in scientific notation as 9.0 x 10^1. This means that 90 is equal to 9.0 multiplied by 10 raised to the power of 1.