OK, let's work through this together. We're starting with 71 and we're going to multiply it by 4, which means we add 71 to itself 4 times.
Step 1: 0 + 71 = 71
Step 2: 71 + 71 = 142
Step 3: 142 + 71 = 213
Step 4: 213 + 71 = 284

So, 71*4 = 284