Understand the idea
From right to left, binary place values are 1, 2, 4, 8 and further powers of two. Add a place value only when its digit is 1.
See a worked example
Binary 1011 = 1 × 8 + 0 × 4 + 1 × 2 + 1 × 1 = decimal 11.
A useful check
The rightmost digit has place value 1, not 2.
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