you would set up the long divison then you would see how much times 6 goes into 8 which 1 then a one goes in the tens place then 3 goes under the dividend then you subtract 8minus 3 and you get 5 then you bring down the one and see how much times 6 goes into 51 which is 8 then you get 48 then subtract 51 minus 48 and u get 3 so your answer is 18 r3