Let's roll up our sleeves and solve this. We have 487 and we're going to multiply it by 4, essentially adding 487 to itself 4 times.
Step 1: 0 + 487 = 487
Step 2: 487 + 487 = 974
Step 3: 974 + 487 = 1461
Step 4: 1461 + 487 = 1948

So, 487*4 = 1948