We began Leap Day by sitting in a circle and passing a ball around while spinning it, to model the rotation of the earth while it orbits the sun. I explained that the earth rotates 365 1/4 times during each orbit, which is why we add a du every four years. At math time, students found as many ways they could to make the number 29, and we did standing long jumps . . .

. . . And measured them in inches and centimeters, data we will use in a future math lesson. We also read a Leap Year poem.