OK, let's work through this together. We're starting with 997 and we're going to multiply it by 4, which means we add 997 to itself 4 times.
Step 1: 0 + 997 = 997
Step 2: 997 + 997 = 1994
Step 3: 1994 + 997 = 2991
Step 4: 2991 + 997 = 3988

So, 997*4 = 3988