OK, let's work through this together. We're starting with 142 and we're going to multiply it by 4, which means we add 142 to itself 4 times.
Step 1: 0 + 142 = 142
Step 2: 142 + 142 = 284
Step 3: 284 + 142 = 426
Step 4: 426 + 142 = 568

So, 142*4 = 568