1) Look at the following numbers before trying to convert binary to decimal. Each of them represent the value in a binary number from left to right.
128-64-32-16-8-4-2-1
2) Look at your binary number, for this example lets use 10010010. For each one add the corresponding number from step 1, the number you come out with is the conversion.
So: 10010010 -> 128+16+2 -> 146
10010010 = 146
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