OK, let's work through this together. We're starting with 337 and we're going to multiply it by 5, which means we add 337 to itself 5 times.
Step 1: 0 + 337 = 337
Step 2: 337 + 337 = 674
Step 3: 674 + 337 = 1011
Step 4: 1011 + 337 = 1348
Step 5: 1348 + 337 = 1685

So, 337*5 = 1685