What is a third added to five sixths?

= 1 / 3 + 5 / 6                    LCM = 6

= 1/3 * (2/2)  + 5 / 6

= 2 / 6 + 5 / 6

= (2 + 5 ) / 6

= 7 / 6

= 7 / 6  or  1 and  1 / 6

a third added to five sixths
=> 1/3 + 5/6 ..
=> make them into like fractions ...(either by LCM or by the way i did ...)
=> 1/3 * 6 + 5/6 * 3
=> 6/18 + 15/18
=> 21/18
=> 7/6 ..

Hope it helps