**Thirty days have September,
**

**April, June, and November;**

**Thirty-one the others date,**

**Except in February, twenty-eight;**

**But in leap year we assign**

**February, twenty-nine.**

So, what do we do with all of those 1/4 days? We add a day in a leap year! The extra day is added to the end of February. It becomes February 29. Itâ€™s called leap day!

**Math Rules for Leap Years**

Which years are leap years? Here are three simple rules for determining the leap years.

- Every year divisible by 4 is a leap year
- But every year divisible by 100 is NOT a leap year
- Unless the year is also divisible by 400, then it is still a leap year.

**Leap-Year Math Quiz**

- List the next five leap years after 2012:
- Sara was born in 1988. What was the first leap year during her lifetime?
- Circle the years that were leap years: 1900, 1972, 1956, 1946, 1992, 1886, 1420, 1600
- List the next five century leap years:
- The day of the week that a date falls on usually skips forward one day the following year. January 1, 2011, was a Saturday; January 1, 2012, was a Sunday. But if there’s a February 29 between the two dates, the day of the week “leaps” forward an extra day: January 1, 2013, will be on a Tuesday (instead of Monday). On which day will January 1 fall in…
- a. 2014?
- b. 2017?

BONUS: A leap year occurs every four years. Based on that information, about how many hours longer than 365 days do you think it takes Earth to revolve around the sun?