Check answers both by estimation and by appropriate independent calculations, using calculators or computers judiciously. 0706.1.3

Links verified on 6/7/2014

1. Comparison Estimator - Similar to Estimator but compares two sets of objects.
2. Disaster Math - Six sets of interactive word problems: Earthquake Math, Hurricane Math, Tornado Math, Wild Fire Math, Winter Storm Math, and Flood Math. [This expired link is available through the Wayback Machine Internet Archive. If the page doesn't load quickly click on Impatient? at the bottom right of the page.]
3. Estimating Sum - No hints or clues given - instruction and review, practice, and a quiz and
4. Estimator - Practice estimation skills by determining the number of objects, length, or area. (parameters: error tolerance)
5. Fermi Questions Library - Fermi questions use estimation procedures to solve questions like "How many jelly beans fill a one-liter jar?"
6. How Big are Things - a printable cube to be used in making size estimations [several versions]
7. How to Simplify a Number - part of being approximate is simplifying numbers
8. More or Less Estimator - Similar to Estimator activity but states a quantity and asks the user to estimate whether the set of objects is more or less than the number given.
9. Pinocchio estimation game - suggested game for developing the skill of estimation
10. 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] [This expired link is available through the Wayback Machine Internet Archive. If the page doesn't load quickly click on Impatient? at the bottom right of the page.] and
11. Scaling the Universe to Your Desktop - estimating size
12. Weigh the Wangdoodles - Your job is to find the weight of each Wangdoodle using the information provided by the scales. To be successful, you will have to make sure that the weight you assign to each Wangdoodle works on each scale. This activity is a fun but challenging introduction to multiple algebraic equations.
13. Word problems - five-question multiple-choice quiz on adding and subtracting fractions
14. Your Body as a Ruler - a user's manual