3 to 7.
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GCF(210, 90) = 30.
The GCF is 30.
210 is not prime. 210 = 2 * 3 * 5 * 7
90% = 90/100 which can be simplified.
To change 210 into a mixed number, divide 210 by the denominator of the fraction you want to convert it to. For example, to convert it to a fraction with a denominator of 5, you would divide 210 by 5 to get 42. Therefore, 210 can be written as 42 2/5 as a mixed number or as 210/5 as an improper fraction.