Why does anything multiplied by zero equal zero?
Think about it as with apples. If 3 people have 5 apples each,
how many apples are there? 3x5 = 15. If, however, no people have 10
apples, there are no people so therefore there are no apples.
Similarly, if 3 people have no apples each, there are 0 apples in
total. Hope this explains it.