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This year we will add the 29th of February to our year? Why do we do that? How can you tell? What if we didn't add a day every 4 years?
Students work with a flow chart to deduce what years are going to be leap years. They learn about the exact measurement of a solar year and how our Gregorian calendar needs to be adjusted to accurately align the calendar with the Earth's revolutions around the Sun.
The activity: Leap-year2020.pdf
CCSS: 5.NBT, 6.NS, 7.NS, N-Q.3
For members we have an editable Word docx and solutions.