1:  Convert the following decimal values to binary:

A1: 

2:  Convert the following binary values to decimal, octal, and hexadecimal:

A2: 

3:  Evaluate the following expressions; assume each value is 8 bits:

A3: 

4:  Evaluate the following expressions; assume each value is 8 bits:

A4: 

5:  Because the ASCII code uses only the final 7 bits, sometimes it is desirable to mask off the other bits. What's the appropriate mask in binary? In decimal? In octal? In hexadecimal? ... 
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