CCENT And CCNA Flash Card Practice Exam:

Binary-to-Decimal Conversions

Be sure to head down to the next blog post for another new CCENT and CCNA practice exam!

This one's straight and simple -- convert the following binary strings into decimals.

One more thing - don't skip over the message between the questions and the answers.  : ) 

Let's jump in!

String 1:  11110000


String 2:  10101010


String 3:  11101111


String 4:  01111111


String 5:  01010101

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Right now, let's get to today's answers.

String 1:  11110000 has the 128, 64, 32, and 16 bits set.  Add 'em up and you have 240.


String 2:  10101010 has the 128, 32, 8, and 2 bits set.  Total is 170.


String 3:  11101111 has all bits set except the 16 bit.  Add all the others up (or subtract 16 from 255) and you have 239.


String 4:  01111111 adds up to 127.


String 5:  01010101 has the 64, 16, 4, and 1 bits set.  That adds up to 85.

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