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How much is 450?

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It's about five times the number of Keys on a Piano.
In other words, 450 is 5.10 times the count of Keys on a Piano, and the count of Keys on a Piano is 0.20 times that amount.
(Moden layout; A0 to C7)
It's about six-and-a-half times the number of Submarines in the US Navy.
In other words, the count of Submarines in the US Navy is 0.160 times 450.
(a.k.a. Subs) (includes all types, all classes) (2015 figures)
It's about eight-and-a-half times the number of Countries in Africa.
In other words, the count of Countries in Africa is 0.120 times 450.
(2016 figures) (sovereign states recognized by the UN only)
It's about nine-and-a-half 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 0.110 times 450.
(Carcharodon carcharias) (average; including developing rows)
A Great White Shark has 48 exposed teeth on their upper and lower jaws. Behind these exposed teeth are developing teeth — up to 300 in about 5 rows. The sharks will continuously lose and replace the exposed teeth throughout their lives.
It's about one-tenth the number of Bishops in the Catholic Church.
In other words, 450 is 0.08408 times the count of Bishops in the Catholic Church, and the count of Bishops in the Catholic Church is 11.890 times that amount.
(2015 figures; total Latin and Eastern Church figures; including Pope)
It's about sixteen times the number of Countries in the European Union.
In other words, the count of Countries in the European Union is 0.063 times 450.
(a.k.a. EU) (2016 figures)
It's about one-twentieth the number of Blue Whales in the World.
In other words, the count of Blue Whales in the World is 19 times 450.
(Balaenoptera musculus) (2002 estimates)