Why Do Some Numbers Feel 'Friendlier' Than Others?

Friendly numbers are ones we feel close to, like 10 or 20. Imagine you have a box of cookies, if you split them evenly among your friends and no one feels left out, that’s a friendly number! Like sharing 12 cookies with 3 friends: everyone gets 4, that’s fair and fun, so 12 is a friendly number too.

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Examples

  1. Sharing 12 cookies among 6 friends gives everyone 2 each, friendly numbers make sharing easier!
  2. A clock has 12 hours, that's a friendly number for telling time.
  3. There are 10 fingers on your hands, that’s why we use base 10 in math.

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