211 



Explanation. 17, 59: d 3a means, take three times the first 

 digit, and subtract it from the preceding bed. 



Ex. gr. I. N=3,2 46349291 



-9 



2,373 

 -6 



3,674 

 -9 



Note to Ex. I. 6,6 5 9 



15= 17-2 -18 



18= 17+1 6,412 



9= 17-8 -18 



21= 174-4 3,949 



27=2-17-7 -9 



Therefore we can operate thus : 9,4 1 



3,2 4 6 3 4 9 2 9 1 -27 



+ 8 374 



Hence the rule : If a multiple of the digit to be subtracted be 

 below the divisor, we can convert subtraction into addition. If 

 it be beyond the divisor, we can subtract the excess instead of the 

 multiple. 



II. The symbol for 89 was + 2 aa' wtich means tliat the first 

 VOL. x. Q 



