Question

Why is one multiply by zero is answer zero

Answer 1

because if you multiply 3 by 0 its the same thing as saying 0+0+0 and that is still 0 (hope this was helpful)

Answer 2

Why can one multiply by zero. Dividing by zero isn't allowed because it results in the same answer (infinity) for every input and therefore is considered "undefined." Multiplying by zero is allowed, even though it results in the same answer for every input (zero).