©trODECIMALS. 57 



Or the denominations of the particula? products will 

 be as follows : 



Feet by feet, give feet. 

 Feet by primes, give primes* 

 Feet by seconds, give seconds. 

 &c. 



Primes by primes, give seconds* 

 Primes by seconds, give thirds. 

 Primes by thirds, give fourths. 

 &c. 



Seconds by seconds, give fourths. 

 Seconds by thirds, give fifths. 

 Seconds by fourths, give sixths. 



3cc. 

 Thirds by thirds, give sixths. 

 Thirds by fourths, give seventhsv 

 Thirds by fifths, give eighths* 



In general thus : 



When feet are concerned, the product Is of the same 

 denomination with the term multiplying the feet. 



When feet are not concerned, the name of the product 

 will be expressed by the sum of the indices of the two 

 fiictors. 



EXAMPLES. 



t. Multiply lof. 4' 5'' by 7f. 8' e\ 

 786 



72 611 

 6 10 x-x 4 



5 2 2 (5 



79 II 066 Answer- 



i^j II ^4^ 



2. Multiply 4f. 7' by 6L 4' o'\ Ans. 29f. o' ^\ 



3. Multiply 



