Many students wrote a lot of math for things that should be immediate. For instance, converting 69d to binary is only about seeing that that number is close to 64. That is, 69 = 64 + 4 + 1, which then allows you to write 1000101 instantly...
Pay attention to data size. Each hex digit is 4 bits. So a 16-bit value (Questions #8 and #9) must have 4 hex digits.
When doing a binary addition: 1 plus 1 plus a carry produces 1 and a carry