Here is an activity from NASA about the extra day during a leap year:
www.jpl.nasa.gov/edu/teach/activity/leap-day-math/
Also, for a fun review of the first 20 elements of the periodic table:
www.teacherspayteachers.com/Product/Chemistry-Leap-Day-Elements-1-20-Chemical-Names-Symbols-to-Atomic-Number-11165495
www.jpl.nasa.gov/edu/teach/activity/leap-day-math/
Also, for a fun review of the first 20 elements of the periodic table:
www.teacherspayteachers.com/Product/Chemistry-Leap-Day-Elements-1-20-Chemical-Names-Symbols-to-Atomic-Number-11165495