create yourself a number line going
64 32 16 8 4 2 1
and then put the binary number underneath it, e.g.:
Code:
Number line: 64 32 16 8 4 2 1
---------------------
Binary: 0 0 1 0 0 0 0
reading across you can see that:
0x64
0x32
1x16
0x8
0x4
0x2
0x1
since the only number you have is 16 the answer is 16 so 0010000 = 16
as csamules says windows calculator will do it for you. stick it in scientific mode and you can convert between binary, hex, octal and decimal