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Tool: Cryptarithms
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Go to: http://www.cut-the-knot.org/cryptarithms/st_crypto.shtml (opens a new window)
Description: Cryptarithms are brain teasers obtained when digits in numerical calculations have been replaced by letters. Customarily, distinct letters stand for different digits. Another term, Alphametics, denotes cryptarithms in which letters form meaningful words, often in meaningful phrases [i.e., son to father: SEND + MORE = MONEY, and father to son: SPEND + LESS = SONNY]. This site offers Java implementations of various cryptarithms and alphametrics, as well as the opportunity to send in your favorites.
Technology Type: JavaScript 
Author: Alexander Bogomolny
Language: English 
Cost: Does not require payment for use

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Courses: Math 3 Operations with numbers, Place value
Math 4 Operations with numbers, Place value
Math 5 Operations with numbers, Base ten, place value
Math 6 Operations with numbers, Base ten, place value

  Jeff L
Comment:Good change of pace for students - solve some first - then try to assemble one.