How Do My Numbers Look to You?

Current

How Do My Numbers Look To You?

This collection of problems provides many different interesting scientific contexts in which to develop the key skills of estimation and approximation, and to decide what units might be appropriate.

Does This Sound about Right? link

Does This Sound about Right? 

Stage: 3 Challenge Level: Challenge Level:1

Examine these estimates. Do they sound about right?

More or Less? link

More or Less? 

Stage: 4 Challenge Level: Challenge Level:1

Are these estimates of physical quantities accurate?

Bigger or Smaller? link

Bigger or Smaller? 

Stage: 4 Challenge Level: Challenge Level:1

When you change the units, do the numbers get bigger or smaller?

Constantly Changing link

Constantly Changing 

Stage: 4 Challenge Level: Challenge Level:2 Challenge Level:2

Many physical constants are only known to a certain accuracy. Explore the numerical error bounds in the mass of water and its constituents.

Approximately Certain link

Approximately Certain 

Stage: 4 and 5 Challenge Level: Challenge Level:2 Challenge Level:2

Estimate these curious quantities sufficiently accurately that you can rank them in order of size