This worksheet includes 10 statements, plus one bonus statement, that should be answered as Always True, Sometimes True, or Never True. Students must also explain why they chose that.
It includes statements like, "All fractions are rational numbers". It's meant to spark discussion and deepen the understanding of the real number system.
I give this worksheet on a class-to-class basis, depending on where I think the students are in their understanding and confidence.
*Update - An answer key has been provided. Please let me know if you disagree with any of it.