Shodor Education Foundation
Shodor Interactivate: Estimator Four
This applet game for two allows you to practice estimating at several different levels of accuracy. You can choose whole number addition, multiplication, percentages or any combination of the three.
Shodor Education Foundation
Shodor Interactivate: Comparison Estimator
Use this applet to practice your estimating skills comparing length, area, counting or a random sampling of those topics. You can also adjust the difficulty and the precision needed. The applet also lets you know how close you are to the...
Math Is Fun
Math Is Fun: Accuracy and Precision
The difference between accuracy and precision is explained, with a precautionary note about being aware of possible bias in the measuring instrument.