Title: An explanation error in the pages 264 and 265
Review: Marcia Ascher makes mention to a chart of counting and she also explains that how it is organized in an a 5 row by 4 column grid. But, she has forgotten to indicate that, this chart has the " yupana " name (accountant), to make mathematical operations. Also, she has omitted to indicate that this chart was used mainly with " quinua " grains to carry out operations of Addition and Subtraction. For other readers they understand better, I believe that it had been better, if Marcia Ascher had placed the illustration called of the " Accountant " and " yupana ". I don't know if it is flaw of M. Ascher or of the transcription of M. P. Closs. Any way the book is a good work. Congratulations
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