40 ARITHMETIC. 



Note i. The second maybe supposed to be divided into 

 60 thirds, and these again into 60 fourths, &:c. 



Note 2. April, June, September, and November, have 

 each 30 days ; each of the other months has 31, except 

 February, which has 28 in common years, and 29 in leap 

 years. 



CIRCULAR MOTION. 



Reduction is the method of bringing numbers from one 

 name or denomination ta another, so as still to retain the 

 same value. 



RULE.* 



I. When the reduction is from a greater name to a lesu 



Multiply the highest name or denomination by as many 

 as make one of the next less, adding to the product the 

 parts of the second name ; then multiply this sum by as 

 many as make one of the next less name, adding to the 

 product the parts of the third name j and so on, through 

 all the denominations to the last. 



II. men 



* The reason of this rule is exceedingly obvious ; for pounds 

 are brought into shillings by multiplying them by 20 ; shillings in- 

 to pence by multiplying them by 12 ; and pence into farthings by 

 multiplying them by 4 ; and tl.e contrary by division : and this 

 will be true in the reduction of numbers consisun;> of any denoni* 

 .inatioa whatever. 



