COMPUTATION RULES. 



XXI 



merely with rules for computation errors, and these are not suited to the other 



/ the worst 

 :il would. 



units in m"St 



. The nimuTi. -:<m to be solved if \vritlen 



out would be 



' 300 in the ordinary nation; 



in the notation by powers of 10 (page xv); 



in the abbreviated notation by i ic(pagexv). 



1 22-1.364*- 



,o4- 



Th usual manner 



: itlinis, as shown In 1 

 i would be worked as foil 

 Multiply toiri-ther tl:- ii.-r than 10" of the 



diivef multiplica- 



nuim-rator, i.e. 



2 x 3.142- X 1.364* x 3= i 



the 



1.6x 



.2x3.3 = 6.336 

 = 1 



Multiply together the terms other than 



den. -mi: 

 Pividf numeral"!- by denominator 



er all indices of powers of 10 in numerator, also in denom- 

 inator, and Mibtrart tin- latter from the former. Or, better, add 

 (algebraically) all the in : -iirn of those in tin- 



denominator, thus : 4 + 2 I I 4=0. 



= 23.72 



all this writii: n and .f the 



I'lanation. In an actual s -luti' 



work would 1-e .-..ndin-ti 1 mentally. 

 >;al multi; alone ln-iin: written out. 



If the solution were m;iM' : :lim-. it mi^ln 'her of tl 



following forms. i il one, the second >ho\\s how the 



:ise with writ in 



. The fa 



lim-d by Mi-nmin ; mentally ti 

 io.se in the denominator bein- taken \\iili rever 



w..ulil not b- written out. but taken 

 i\ written. 



tor. 



log 2. = < 



141 =0.9944 

 \ = 0.4044 

 i < ) OOO. = 4. 



log 300. 



6Joi8 





Kes.ilt. 



2372 



477' 



a.1769 



,v>.s 



