OK, let's work through this together. We're starting with 375 and we're going to multiply it by 4, which means we add 375 to itself 4 times.
Step 1: 0 + 375 = 375
Step 2: 375 + 375 = 750
Step 3: 750 + 375 = 1125
Step 4: 1125 + 375 = 1500

So, 375*4 = 1500