write the missing numbers in this figure so as to make the sum of the four numbers in each row and each column 55.
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the missing numbers in this figure so as to make the sum of the four numbers in each row and each column 55.
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A Reading list of Tricky Math Books, most of which I have used for this site.
Learn about the original computer: The Abacus (http://www.ee.ryerson.ca:8080/~elf/abacus/)
Play a Math-Chase Game (http://dev.eyecon.com/marcia) -- for one or two players. (If you're using Netscape, Do Not Scroll down the page while this
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