Here are two estimation problems.
The first is from TERC Investigations:
The second is from Andrew Stadel's Estimation180:
I have some questions about the relationship of these two problems to each other:
- Do these two problems help students get better at the same thing? Or do these two problems help students improve at different skills?
- What sort of knowledge is needed to successfully tackle the first estimation task? The second?
- What does the first problem seem to mean by "number sense"? What does the "second"?
- Can we infer why estimation is valuable to the writers of the first problem? The second?