- A+ Math
As part of the "A+ Math" main page, this link will take students directly to an interactive flash card game practicing estimation and rounding skills.
- Beat the Calculator
This site contains an enormous list of "tricks" for getting an exact computation for very specific types of problems. For example, adding two consecutive numbers, multiplying a two-digit number by 51, dividing a two-digit number by 15, squaring various types of number, finding percentages, and more. The patterns include an example and an explanation.
- Estimation---K thru 8
These pages teach estimation and rounding skills covered in Kindergarten through eighth grade math courses. Each page has an explanation, interactive practice, and challenge games about estimation. Some topics include front-end estimation, estimating sums and differences, and rounding.
Players select squares on a board that round to the same hundred. A concentration version is also available.
- Estimator Four
Two players must enter an acceptable estimate to a computation within a time limit to be able to place game piece on the board.
- PDF activities for estimation
This link leads to a PDF formatted group of activities to use with students regarding estimation. All of the activities provide real-world applications for using estimation.