Celebrating Thirdsday

Here is a classroom activity to help you enjoy Thirdsday! Thirdsday celebrates the number 1/3 and occurs when January 3rd (or 1/3 when written as a US date) falls on a Thursday, as it does in 2019. The activity for your students is about an intriguing sum that gives us 1/3.

Equipment needed

The worksheet, teachers notes, use of a spreadsheet or a calculator

Curriculum Topics Covered

Fractions, using spreadsheets, geometric series

More information

This activity accompanies Matt Parker’s video (below) about Thirdsday. Now you can celebrate Thirdsday as a whole class!

Thirdsday was invented by mathematician Jim Propp (@JimPropp on Twitter). He tells us more about the special mathematical day in his blog post!