OK, let's crack this. We're given 342 and our task is to multiply it by 4. Essentially, we'll be adding 342 to itself 4 times.
Step 1: 0 + 342 = 342
Step 2: 342 + 342 = 684
Step 3: 684 + 342 = 1026
Step 4: 1026 + 342 = 1368

So, 342*4 = 1368