OK, let's work through this together. We're starting with 377 and we're going to multiply it by 4, which means we add 377 to itself 4 times.
Step 1: 0 + 377 = 377
Step 2: 377 + 377 = 754
Step 3: 754 + 377 = 1131
Step 4: 1131 + 377 = 1508

So, 377*4 = 1508