OK, let's work through this together. We're starting with 587 and we're going to multiply it by 4, which means we add 587 to itself 4 times.
Step 1: 0 + 587 = 587
Step 2: 587 + 587 = 1174
Step 3: 1174 + 587 = 1761
Step 4: 1761 + 587 = 2348

So, 587*4 = 2348