OK, let's work through this together. We're starting with 548 and we're going to multiply it by 7, which means we add 548 to itself 7 times.
Step 1: 0 + 548 = 548
Step 2: 548 + 548 = 1096
Step 3: 1096 + 548 = 1644
Step 4: 1644 + 548 = 2192
Step 5: 2192 + 548 = 2740
Step 6: 2740 + 548 = 3288
Step 7: 3288 + 548 = 3836

So, 548*7 = 3836