COMPOUND SUBTRACTION. 47 



2, Begin at the right hand, and take the number in 

 each denomination of the lower line from the number 

 standing above it, and set down their remainders below 

 them> 



3, But if the number below be greater than that above 

 it, increase the upper number by as many as make one of 

 the next higher denommation, and from this sum take the 

 number in the lower line, and set down the remainder as 

 before. 



4, Carry the unit borrowed to the next number in the 

 lower line, and subtract as before j and so on, till the 

 whole is finished •, and all the several remainders taken 

 together, as one number, will be the \vhole difference re- 

 quired. 



The method of proof is the same as in simple sub- 

 traction. 



TROY WEIGHT. 



APOTHECARIES^ 



