Sagot :
Take 1 from 5 to make it easier to subtract 2 1/2, so it will be 4 2/2 which is still equal to 5. Now subtract 2 1/2 from 4 2/2.
2 1/2 can be written as 5/2 and 5 can be written as 10/2
so 10/2-5/2=5/2 or 2 1/2
so 10/2-5/2=5/2 or 2 1/2