Let's get this math done. We have 538 and we're going to multiply it by 7. This is the same as taking 538 and adding it to itself 7 times.
Step 1: 0 + 538 = 538
Step 2: 538 + 538 = 1076
Step 3: 1076 + 538 = 1614
Step 4: 1614 + 538 = 2152
Step 5: 2152 + 538 = 2690
Step 6: 2690 + 538 = 3228
Step 7: 3228 + 538 = 3766

So, 538*7 = 3766