The answer is 13.5 see 12 times 1 is close to 16 so one will be ur answer so u carry the one and then subtract 12 from 16 which will equal 4 then u bring down the two and then u gingure oit what is closets to 42 which will be 36 so u carry the 3 and put 36 and subtract it and it will be 5 so ur full answer is 13.5