681=680+1, so 681/5=680/5+1/5=136+1/5 or 136 1/5. 1/5 can also be expressed in decimal as 0.2, so an alternative answer is 136.2. Another approach is to use 5=10/2 so dividing by 5 is the same as multiplying by 2 and dividing by 10: 681/5=681*2/10=1362/10=136.2. Multiplying by 2 is easier than dividing by 5. And dividing by 10 just moves the decimal point to the left one place.