An introduction to the Hupa number system is provided in this workbook, one in a series of numerous materials developed to promote the use of the Hupa language. The book is written in English with Hupa terms used only for the names of numbers. The opening pages present the numbers from 1-10, giving the numeral, the Hupa word, the English word, and an illustration of the number set. Students practice writing the Hupa number names, solve simple addition problems, and write their own addition problems. The same procedure is repeated for numbers from 10-20. Students then practice the Hupa system of combining numbers from 21-99. Illustrations of number sets depict artifacts of Hupa culture. Answers are provided for each of the 18 work pages. A chart of the Hupa Unifon alphabet with computer-generated characters is included. (JHZ)