OK, let's work through this together. We're starting with 140 and we're going to multiply it by 4, which means we add 140 to itself 4 times.
Step 1: 0 + 140 = 140
Step 2: 140 + 140 = 280
Step 3: 280 + 140 = 420
Step 4: 420 + 140 = 560

So, 140*4 = 560