OK, let's crack this. We're given 351 and our task is to multiply it by 4. Essentially, we'll be adding 351 to itself 4 times.
Step 1: 0 + 351 = 351
Step 2: 351 + 351 = 702
Step 3: 702 + 351 = 1053
Step 4: 1053 + 351 = 1404

So, 351*4 = 1404