Question

The amount of ROM needed to implement a 4 bit multiplier is?

Answer 1

To calculate amount needed we use the following formula:
$2^{a} \cdot b$
Where a - number of input bits
b - number of output bits
In this case we have:
$2^{4} \cdot 2^{4} = 2^{8} = 256$ input bits
The number of output bits would be 8.
$256 \cdot 8 = 2048$