A lunar month has 28 days. About how many lunar months are in a year 365 days?

To find out the result, we have to divide 365 days by 28 days:

365 / 28 = 13,03571428571429

So we can see it's 13 lunar months with something extra. To find that something extra we can multiply 28 by 13 and then substract the result from 365:

365 - (13 * 28) =

= 365 - 364 =

= 1

So there are 13 lunar months and one day.