Question

True or false the number 0 is the multiplicative identity ?

Answer 1

The multiplicative identity is a number that when you multiply by it, it does not change what you multiplied.

1 * 78 = 78
1 * 7 = 7
1 * (-9) = -9

Everything you multiply by 1 remains the same.
1 is the multiplicative identity.

Any number you multiply by 0 gives an answer of zero, not the original number, so zero is not the multiplicative identity.