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page 66 and 67 talks about annexing cipher does make changes to the original values.
and look at the addition and multiplication table.
Addition table of page 11 and multiplication table in page 12 is kind of cool we can show how She used the zero to add.
Arithemetic book by first female writer in United States of America.
<a href="http://books.google.com/books?id=qMA2AAAAMAAJ&lpg=PA11&ots=6Em7QrYQFf&dq=Beecher%2C%20Catherine%20Esther%20(1833).%20Arithmetic%20Simplified&pg=PA41&ci=101%2C1229%2C781%2C92&source=bookclip"><img src="http://books.google.com/books?id=qMA2AAAAMAAJ&pg=PA41&img=1&zoom=3&hl=en&sig=ACfU3U2MvKyex7A2yWLaBfPj7s-T9lLt-g&ci=101%2C1229%2C781%2C92&edge=0"/></a>