• The highest digit used in "octal" numbers is 7.
• The highest digit used in "hexadecimal" numbers is F.
• The highest digit used in "binary" numbers is 1.
• The highest digut used in "decimal" numbers is 9.
• The value of the highest digit in the base 5 number system is 5.
• The rightmost digit of a number represents its value multiplied by the base raised to the 0th power.
• The binary number 11011011 in decimal is 219.
• The octal number 476 is 100111110 in binary.
• The hexadecimal number FF in decimal is 255.
• The decimal number 255 is FF in hexadecimal.

1. The ones-complement of 11011011 is 00100100.
2. The ASCII character being represented by 00100100 is the $.
3. The binary addition of 11001 + 1110011 results in 10001100.
4. The octal addition of 665 + 771 results in 1656.
5. The hexadecimal addition of ABC + ABC results in 1578.
6. Signed-magnitude has two ways of representing zero.
7. The decimal value -273 is represented as 111101110 in twos-complement.
8. The negative number represented in twos-complement of 111100001111000 is -3855.
9. 57 different bits are needed to represent each county with a different code.
10. Data are the physical symbols that represent information.
11. Some 8-bit memory boards have nine sets of bits as a fail-safe.
12. ?
13. The set of wires through which data travels between components of a computer is called a bus.
14. The CPU is the collection of programs that provide the instructions that computer carries out.
15. The ALU performs basic operations in the central processing unit such as adding and subtracting, plus logical operations such as AND and OR.

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