CLOSE

# The Number of the Day: 3.5

A newborn panda weighs approximately 3.5 ounces.

Related Fact: This is about 1/900 of its mother's weight.

[Source: The Encyclopedia of Mammals. See previous Numbers of the Day here.]

iStock
arrow
video
This Puzzling Math Brain Teaser Has a Simple Solution
iStock

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.

What Number Is The Answer?

### SECTIONS

arrow
LIVE SMARTER
arrow
LIVE SMARTER
More from mental floss studios