( »«5 ) 
« 
Subtra(SHon in this Arithmetick is reduced to Addi- 
tion, by changing all the Signs of the Number to be 
fubtraded. 
Thus, if from («") 719^8429(337, &c. we are to 
fubtrad v''»-2)8io73 5926, &c. the Remainder will be 
found as in Example 4. 
c?o 
(7m) 
C 4- ) 
72938429637 &c. 
810735926 &c. 
73747 1 54343. 
Thus in all Cafes v;ill Addition and Subtradion be 
eafily performed. ; But the chief life of this Method 
will be, to eafe the trouble of prolix Multiplications. 
And here, as well as in Divifion, the firft and molt va- 
luable Figures may be firft found, and confequently the 
Produd may be continued to as many Places as fliall 
be required, without finding any unnecefTary Figures,- 
which is a convenience not to be had in the ordinary 
way of Multiplication. 
Let it be propofed to Multiply together the Numbers 
8605729398715 and 389175836438, which reduced 
to fmall Figures will be 1 14143314013 15 and 4112 
24244442. Write down thefe two Numbers one un- 
der the other upon a flip of Paper, with the Figures 
at equal diflances, and then cut them afunder. ' Take 
either of the Numbers for a Multiplier, and place it 
over the other in an inverted pofition, fo as its *firfl 
' Figure 
