How do you change 0111 to 7?

Answer 1

From right to left, you have the 1's bit, the 2's bit, the 4's bit and the 8's bit. If there's a 1 in the 1's bit, add 1. If there's a 1 in the 2's bit, add 2. If there's a 1 in the 4's bit, add 4. If there's a 1 in the 8's bit, add 8.