_5<5 ARITHMETIC. 



DUODECIMALS* 



Duodecimals arc so called because they decrease by 

 twelves, from the place of feet tov/ard the right hand* 

 Inches are sometimes called primes, and are marked thus '5 

 the next division, after inches, is called parts, or seconds, 

 and Is marked thus '' > the next is thirds, and marked 

 thus ^'^ ; and so on* 



Duodecimals are commonly Used by workmen and ar-» 

 tlficers in casting up the contents of their work.- 



MuLTiPLiCArioN of Duodecimals ; or^ 



Cross Multiplication, 



RULE. 



1. Under the multiplicand write the same names or de- 

 nominations .of the multiplier •, that is, feet under feet, 

 inches under inches, parts under parts, &c. 



2. Multiply each term in the multiplicand, beginning 

 at the lowest, by the feet in the multiplier, and write each 

 result under its respective term, observing to carry an unit 

 for every 12, from each lower denomination to its next 

 superior. 



3. In the same manner multiply every term in the mul- 

 tiplicand by the inches in the multiplier, and set the re- 

 sult of each term one place removed to the right of those 

 In the multiplicand. 



4. Proceed in like manner v.ith the seconds and alt the 

 rest of the denominations, if there be any more ; and the 

 ^m of all the lines will hi the product required. 



Or 



