It's about eight-and-a-half times the number of Wolves in Yellowstone National Park.
In other words, 900 is 8.650 times the count of Wolves in Yellowstone National Park, and the count of Wolves in Yellowstone National Park is 0.1160 times that amount.(a.k.a. Henihco'oo; a.k.a. Héetíhco'oo) (December 2014 figures; Wyoming Park area)
As of the 2014 population count, there were 104 wolves living in Yellowstone National Park, in twelve packs. All of the wolves now living in the Park are thought to have descended from the 66 wolves (re)introduced into the Park in 1995-96.
It's about one-tenth the number of Blue Whales in the World.
In other words, 900 is 0.110 times the count of Blue Whales in the World, and the count of Blue Whales in the World is 9.10 times that amount.(Balaenoptera musculus) (2002 estimates)
The worldwide population of blue whales (as of 2002) is estimated to be between 5,000 and 12,000. An estimated 378,200 blue whales were killed during the height of whaling in the late nineteenth and early twentieth centures
It's about one-tenth the number of Benches in Central Park.
In other words, the count of Benches in Central Park is 10 times 900.(Manhattan, New York City, New York)
It's about ten times the number of Keys on a Piano.
In other words, the count of Keys on a Piano is 0.10 times 900.(Moden layout; A0 to C7)
It's about one-tenth the number of Written Characters in the Chinese Language.
In other words, 900 is 0.09623 times the count of Written Characters in the Chinese Language, and the count of Written Characters in the Chinese Language is 10.390 times that amount.(zhōngwén, 中文) (Hànzì, 汉字/漢字; Shuowen Jiezi count; distinct characters)
According to the Han Dynasty dictionary, Shuowen Jiezi (說文解字), there are 9,353 distinct Han characters used to depict the Chinese language. Fluency in written Chinese requires mastery of 4,000 - 5,000 of these characters.
It's about thirteen times the number of Submarines in the US Navy.
It's about seventeen times the number of Countries in Africa.
In other words, the count of Countries in Africa is 0.059 times 900.(2016 figures) (sovereign states recognized by the UN only)
The continent of Africa includes 54 sovereign countries recognized by the United Nations as of 2016. It is the second-most populous continent in the world, with 1.1 billion inhabitants.