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  • #: 149724
  • Price: free ($0.00) In Apple Store
  • Category: Education
  • Updated: 2010-12-17
  • Current Version: 1.0
  • 1.0
  • Size: 0.80 MB
  • Language: English
  • Seller: Peter Malcolm
  • Requirements: Compatible with iPhone, iPod touch, and iPad. Requires iOS 4.1 or later.
  • © 2010, Curry School of Education, University of Virginia
  •  Add to Favorite apps



Practice your estimation skills with this calculator. It only shows you the answer to a math problem after you make a reasonable estimate. Keep an eye on the error bar in the middle of the screen, and try to keep your estimate-errors (how far off you are) inside the red box. An estimate whose error bar is inside the red box is a reasonable estimate. Choose wisely!

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The information may be outdated (2011-04-17 16:47:48). For actual information go to iTunes

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