I am having trouble trying to convert values between decimals, binary, hexadecimals. Also, are there any shortcuts to make the process more simpler?

1. Which of the following is the decimal representation of the unsigned binary integer 11111000? a. 238 b. 248 c. 278 d. None of the other answers are correct 2. Which of the following is the decimal representation of the unsigned binary integer 11001010? a. 202 b. 302 c. 422 d. None of the other answers are correct 3. What are the minimum numbers of binary bits needed to represent the unsigned decimal integers 65 and 409? a. 65 requires 8 bits and 409 requires 10 bits b. 65 requires 6 bits and 409 requires 8 bits c. 65 requires 7 bits and 409 requires 9 bits 4. Which of the following are the hexadecimal representations of the binary numbers 0011 0101 1101 1010 and 1100 1110 1010 0011? a. 35DA and CEA3 b. 35DA and CEB3 c. 35EA and CEA3 d. None of the other answers are correct 5. Which of the following is the binary representation of the hexadecimal number A4693FBC? a. 1010 0100 0111 1001 0011 1111 1011 1100 b. 1010 0100 0110 1001 0111 1111 1011 1100 c. 1010 0110 0110 1001 0011 1101 1011 1100 d. 1010 0100 0110 1001 0011 1111 1011 1100