OK, let's crack this. We're given 386 and our task is to multiply it by 3. Essentially, we'll be adding 386 to itself 3 times.
Step 1: 0 + 386 = 386
Step 2: 386 + 386 = 772
Step 3: 772 + 386 = 1158

So, 386*3 = 1158