OK, let's crack this. We're given 187 and our task is to multiply it by 4. Essentially, we'll be adding 187 to itself 4 times.
Step 1: 0 + 187 = 187
Step 2: 187 + 187 = 374
Step 3: 374 + 187 = 561
Step 4: 561 + 187 = 748

So, 187*4 = 748