How do you do mental division?

This is just an example hope it helps

Divide.Multiply & subtract.Drop down the next digit. t o. ) 5 8. Two goes into 5 two times, or 5 tens ÷ 2 = 2 whole tens -- but there is a remainder! t o. ) 5 8. - ...Divide.Multiply & subtract.Drop down the next digit. t o. 2 9. ) 5 8. - 1 8. Divide 2 into 18. Place 9 into the quotient.

At a constant it will take one hour to travel 32 mi.at that speed it will take 1/2 hr to travel the remaining 16 mi.it will take 1+1/2 hr to travel the 48mi @ 32mph.so 1 hr = 60 min& 1/2 hr = 30 min1+1/2 hr = 90 min.there are 60s in each 90 × 60 = 3600 seconds.the real question seriously is he why are they driving so slow? ! lol.