Q: I try to keep track of how much ma'aser money I
owe. However I did lose track of some small amounts of money that I earned. How
should I go about giving ma'aser for this money?
A: According
to Horav Shlomo Miller Shlit"a, the main issue you have to be concerned
with is that your giving of maaser should not be done as a neder (promise)
to be kept, but rather as a voluntary gift, then you calculate the amount due
to the best of your ability.