Direct Cache Mapping Hit Or Miss
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@Nathan: 
The binary address is split as a tag-part and the block size. Basically, the cache is split as many-byte blocks and tag each entry maps to a block and the index, or offset, is added to the address to address a byte.

So the binary addresses are 8-bits long. And based on the question the block seems to be 8 bytes long (hence 3 LSB bits for Index, also called offset). This leaves 5 additional bits for tag (Remember addresses are 8 bits long).