The Milky Way Galaxy
More or Less than a Billion?

Look over this list. After you read each item, see if you can figure out, “Is this number more or less than a billion?” If you think the item is more, select the word More. If you think it’s less, select the word Less. If you need help click the hint button.

  1. hairs on your head
  2. seconds since you were born (if you’re less than 31!)
  3. people in the U.S.
  4. people in the world
  5. inches between New York and Los Angeles
  6. cells in your body
  7. letters mailed each week in the U.S.
  8. gallons of water Americans flush down
    their toilets every day


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