First Three Steps of Converting Decimal 235 to Binary

You do Step 4 repetitively for each successive lower power of 2, until you complete Step 4 for 2⁰, or 1. Because the first 3 steps used 2⁷ (128), the first pass through Step 4 uses 2⁶ (64) as the power of 2, as shown in Table B-7.