what is 900 is 1/10 of
\(\frac{1}{10} \ of \ x=900\\\\ \frac{1}{10}*x=900\\\\ \frac{x}{10}=900\\\\ x=10*900\\\\ \boxed{x=9,000}\)
a easy way is 900 x 10 keep in mind this does not always work the answer is 9,000