OK, let's work through this together. We're starting with 628 and we're going to multiply it by 7, which means we add 628 to itself 7 times.
Step 1: 0 + 628 = 628
Step 2: 628 + 628 = 1256
Step 3: 1256 + 628 = 1884
Step 4: 1884 + 628 = 2512
Step 5: 2512 + 628 = 3140
Step 6: 3140 + 628 = 3768
Step 7: 3768 + 628 = 4396

So, 628*7 = 4396