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Remote Ready Biology Learning Activities has 50 remote-ready activities, which work for either your classroom or remote teaching.
Assessing understanding scale
If I were assessing Paul's activity, I'd use
These assessments would be largely to determine, what do I need to keep working on? What is still confusing? Who needs more help and experience with what? Where is understanding still being built, still evolving? Who needs more support with the concepts, who needs to build their skills, who needs enrichment? I'd like to think more about asking for their understanding about comparing the relative sizes of the different things we measures (similar to Stephen's answer of how many water molecules fit across a hair...)
My eventual goal , and what I think would be an authentic assessment, would be what Stephan was describing: applying and using scale in other projects. I would want to engage the students in more experiences and practice with scale before using this kind of assessment.