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How much is 51?

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It's about nine-tenths the number of Countries in Africa.
In other words, 51 is 0.940 times the count of Countries in Africa, and the count of Countries in Africa is 1.10 times that amount.
(2016 figures) (sovereign states recognized by the UN only)
It's about one-and-one-tenth times the number of Teeth in a Great White Shark's Mouth.
In other words, the count of Teeth in a Great White Shark's Mouth is 0.910 times 51.
(Carcharodon carcharias) (average; including developing rows)
It's about seven-tenths the number of Submarines in the US Navy.
In other words, 51 is 0.710 times the count of Submarines in the US Navy, and the count of Submarines in the US Navy is 1.40 times that amount.
(a.k.a. Subs) (includes all types, all classes) (2015 figures)
It's about three-fifths the number of Keys on a Piano.
In other words, 51 is 0.580 times the count of Keys on a Piano, and the count of Keys on a Piano is 1.70 times that amount.
(Moden layout; A0 to C7)
Most modern keyboards have 88 keys, comprising seven octaves and an additional major third. A full-size, acoustic piano may have as many as 12,000 separate parts.
It's about one-and-four-fifths times the number of Countries in the European Union.
In other words, the count of Countries in the European Union is 0.560 times 51.
(a.k.a. EU) (2016 figures)
It's about half the number of Wolves in Yellowstone National Park.
In other words, 51 is 0.490 times the count of Wolves in Yellowstone National Park, and the count of Wolves in Yellowstone National Park is 2.04 times that amount.
(a.k.a. Henihco'oo; a.k.a. Héetíhco'oo) (December 2014 figures; Wyoming Park area)
It's about two-fifths the number of Elements on the Periodic Table.
In other words, 51 is 0.4320 times the count of Elements on the Periodic Table, and the count of Elements on the Periodic Table is 2.310 times that amount.
(a.k.a. Periodic Table of the Elements, a.k.a chemical elements) (confirmed elements as of 2016)
From element number one, hydrogen, to element one-hundred eighteen, ununoctium, there are 118 confirmed elements on the Periodic Table. Ninety-four of the elements exist in nature, and the remaining twenty-four have only been synthesized in labs (not having occurred naturally in the time since scientists have begun researching them)