Final answer:
To convert from binary to hex, group the binary digits into groups of four starting from the right. Each group of four digits represents a hex digit.
Step-by-step explanation:
In order to convert from binary to hex, we can group the binary digits into groups of four starting from the right. Each group of four digits represents a hex digit. Here are the conversions:
a. 1100101000111111 = 1100 1010 0011 1111 = CA3F
b. 111100100011000.001111110101 = 1111 0010 0011 0000 0001 1111 0101 = F2301F5