Complete. Six times what equal zero?
Here, we have six groups. If it was six groups of one, that would make six. One, two, three, four, five, six. What do we multiply by six to give us an answer of zero? Six times zero equal zero. The missing number is zero. One times zero is zero, so is two times zero. Three lots of zero is zero, so is four. Five times zero is zero. And six times zero is zero. The missing number is zero.