Let's roll up our sleeves and solve this. We have 205 and we're going to multiply it by 4, essentially adding 205 to itself 4 times.
Step 1: 0 + 205 = 205
Step 2: 205 + 205 = 410
Step 3: 410 + 205 = 615
Step 4: 615 + 205 = 820

So, 205*4 = 820