Recognize errors generated by rounding. 0606.1.3

Links verified on 1/03/2010

1. Estimating by Rounding - Addition with regrouping - instruction and review, practice, and a quiz &
2. Estimating by Rounding - Subtraction with regrouping - instruction and review, practice, and a quiz &
3. Rounding - Discover how rounding is a process which produces another number that is close to the original number. Learn how to round numbers up or down to the nearest rounding number. Work through the lesson, experiment with the interactive figure and then answer ten questions. [caution: do not submit until you have selected answers to all of the questions] and
4. Round About - estimate by rounding.
5. Rounding Off - Three levels are available in this game from BBC Education