LETTER XIII: 
IN this letter I mean to call your atten- 
tion to the Divifion of whole numbers, 
fra6lions, and of algebraical quantities. As 
Subtraction is the reverfe of Addition, fo is 
Divifion the reverfe of Multiplication. But 
we have feen that Multiplication is really a 
compendious Addition, and you will foon 
perceive, that Divifion is nothing more than 
a method of determining, how many times 
a lefs number is contained in, or may be 
fubtracled from, a greater ; fo that all the 
various operations of Arithmetic, are in faft, 
Additions or Subtractions. For example, 
Add 
Sum 3 5 
In the fourth of thefe examples, the 5 on 
the left is called the divifor^ the 7 is the di- 
vidend, 
'5 
Multiply 
5 
From 
7 
5 
By _ 
_7 
Take 
5 
5 
Produft" 
35 
Remains 
2 
5 
i 
* 
5 
5 
5)7(i 
15 

