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Number. 12 units — 1 dozen (doz.). 12 dozen = 1 gross (gro.). 12 gross =• 1 great gross. 20 units — 1 score.

Standard Elementary Arithmetic: Combining Oral and Written Exercises - Page 166
by Edward Sylvester Ellis - 1886 - 192 pages
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A Common School Arithmetic

Daniel Barnard Hagar - Arithmetic - 1871 - 352 pages

...bundles " Ibale. 354. In Counting certain articles, use is made of the following TABLE. 12 ones are 1 dozen doz. 12 dozen " 1 gross gro. 12 gross " 1 great gross. . . . grt. gro. 355. — Ex. 1. How many ones are 1 gross ? 2. How many dozens is f of a great gross...

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