Leap Years (10 Questions)


  1. What is a leap year?
  2. How often do leap years occur?
  3. On what date is Leap Day observed in a leap year?
  4. Which calendar introduced the concept of leap years: the Julian calendar or the Gregorian calendar?
  5. According to the Gregorian calendar, which years are leap years?
  6. What is the mathematical rule used to determine if a year is a leap year or not?
  7. Who introduced the concept of leap years into the calendar system?
  8. In what year did Pope Gregory XIII introduce the Gregorian calendar, which refined the leap year system?
  9. In which years were the Summer Olympics held avoiding leap years?
  10. Why are some years divisible by 100 not considered leap years unless they are also divisible by 400?


  1. A leap year is a year that contains an additional day, known as Leap Day.
  2. Leap years occur every four years.
  3. Leap Day is observed on February 29th in a leap year.
  4. The concept of leap years was introduced in the Julian calendar.
  5. According to the Gregorian calendar, years divisible by 4 are leap years, except for years that are divisible by 100 but not by 400.
  6. The leap year rule is:
    • If the year is evenly divisible by 4, it is a leap year.
    • However, if the year is evenly divisible by 100, it is not a leap year.
    • Unless the year is also evenly divisible by 400, then it is still a leap year.
  7. The concept of leap years was introduced by Julius Caesar and further refined by Pope Gregory XIII.
  8. Pope Gregory XIII introduced the Gregorian calendar in 1582.
  9. Summer Olympics are typically held in non-leap years, except for 1900 and 2021.
  10. Years divisible by 100 are not leap years unless they are also divisible by 400 to accommodate for inaccuracies in the calendar system.



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