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The Number of the Day: 40%

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During its 62 years of operation, the immigration station at Ellis Island welcomed in excess of 12 million immigrants to the United States. As a result, an estimated 40% of U.S. citizens have at least one ancestor who passed through its gates.


Related Fact: Located just a short boat trip from Ellis Island stands the Statue of Liberty - whose (now green-colored) copper exterior measures just 3/32 of an inch in thickness.


[Sources: History and StatueofLiberty.org. See previous Numbers of the Day here.]

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This Puzzling Math Brain Teaser Has a Simple Solution
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Fans of number-based brainteasers might find themselves pleasantly stumped by the following question, posed by TED-Ed’s Alex Gendler: Which sequence of integers comes next?

1, 11, 21, 1211, 111221, ?

Mathematicians may recognize this pattern as a specific type of number sequence—called a “look-and-say sequence"—that yields a distinct pattern. As for those who aren't number enthusiasts, they should try reading the numbers they see aloud (so that 1 becomes "one one," 11 is "two ones," 21 is "one two, one one,” and so on) to figure the answer.

Still can’t crack the code? Learn the surprisingly simple secret to solving the sequence by watching the video below.

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What Number Is The Answer?
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