Computer Science for IGCSE & O level - Data Representation (Section 5 - No. 5)

What is the decimal equivalent of the binary number 110101?

101

1 * 2^5 + 1 * 2^4 + 0 * 2^3 + 1 * 2^2 + 0 * 2^1 + 1 * 2^0 = 32 + 16 + 0 + 4 + 0 + 1 = 53