Some Useful Tables
This presentation shows the following five tables:

BinaryHexadecimal
conversion between binary and hexadecimal

DecimalHexadecimal
conversion between decimal and hexadecimal

Multiples of 16
multiples of 16 from 0 to 9

OctalBinary
conversion between octal and binary

Powers of 10 and 2
approximate conversion between powers of 10 and powers of 2 and their
prefixes and abbreviations
These tables are also available as a singlepage
PDF file.