1. 

Reduce 128352 to its lowest terms.
238368

A. 3/4
B. 5/13
C. 7/13
D. 9/13

Answer: Option C

Explanation:

128352) 238368 ( 1
        128352
    ---------------
    110016 ) 128352 ( 1
             110016
     ------------------  
        18336 ) 110016 ( 6       
                110016
                -------
                   x
                -------
 So, H.C.F. of 128352 and 238368
 = 18336.

 128352     128352 ÷ 18336    
 ------  =  -------------- 
 238368     238368 ÷ 18336    

= 7/13