This activity helps reinforce large number place value using the populations of countries around the world. It is interesting and relevant for students in the intermediate or middle school grades, and it could easily tie in with social studies curriculum.
If students have internet access, they can search for the population of each country independently. If not, you can find the populations and read them aloud for students to record. Then students need to work with the numbers: rounding, ordering, estimating, and calculating.
This activity works well when completed in partners, small groups, or independently.