Question

12 1/2 minus 10 3/8 ??

Answer 1

`12 (1)/(2) - 10 (3)/(8) =`

`(2*12+1)/(2) - (8*10+3)/(8) =`

`(25)/(2) - (83)/(8) =`

Different denominators, the least common multiple is made. Calculate the least common multiple of (2,8) and replace the denominators:
LCM (least common multiple) of (2,8)
2,8 | 2
1, 4| 2
1, 2|2
1, 1|____ 2*2*2 = 8


`(25)/(2) - (83)/(8) =`

`(8/2*25)/(8)- (8/8*83)/(8) =`

`(4*25)/(8) - (1*83)/(8) =`

`(100)/(8) - (83)/(8) = \boxed{(17)/(8) }`

Answer:

`\boxed{(17)/(8) }`