CONVKRSION of numbers from ONa SCALE TO ANOTHER. Jg-y 



has been said to the r-ule of duodecimals, or cross multipli- to the. -uis of 

 cation. tltiodecimals. 



To multiply feet, inches, parts, &c. by similar denomina- plication, 

 tions. 



Rule. Transform the number of feet, if above 12, into the 

 duodenary scale, and set the inches, parts, &c. as decimals ; 

 then multiply as in common arithmetic, exeept, carrying for 

 every 12, instead ■■>i every 10, as in common operations. 



Example. Multiply 3 feet, 5 inches, 7 parts, by 3 feet, 



11 inches, 2 parts. 



Here 3-57 



3-y2 



6y2 

 3215 



y49 



12"3542 =14 feet, 8' 5", 4', 2" 



Multiply 17 feet, 3', 4" by 19 feet, 5', 11". 

 15-34 

 17-5y 



13^08 

 7248 

 ^0y4 

 1534 



240-(:,688 r= 336 ft. 9', 6", 8'", 8"". 



Find the solidity of a cube, the side of which is 3 feet, 7 in. 7 

 parts. 3 '77 



377 



2151 

 2151 



11-2361 



377 



784067 

 784067 

 336?)63 



3y'(l}(p<{>(pl7 =47 ft. 10', 10", 10"', 10'"', 1, 7. 

 , ., .1 And 



