101 = 1·2² + 0·2¹ + 1·2⁰ = 4 + 0 + 1 = 5
101₍₁₀₎ = 100·10² + 0·10¹ + 1
101₍₂₎ = 1·2² + 0·2¹ + 1·2⁰ = 4 + 0 + 1 = 5
