OK, let's crack this. We're given 985 and our task is to multiply it by 4. Essentially, we'll be adding 985 to itself 4 times.
Step 1: 0 + 985 = 985
Step 2: 985 + 985 = 1970
Step 3: 1970 + 985 = 2955
Step 4: 2955 + 985 = 3940

So, 985*4 = 3940