OK, let's work through this together. We're starting with 629 and we're going to multiply it by 13, which means we add 629 to itself 13 times.
Step 1: 0 + 629 = 629
Step 2: 629 + 629 = 1258
Step 3: 1258 + 629 = 1887
Step 4: 1887 + 629 = 2516
Step 5: 2516 + 629 = 3145
Step 6: 3145 + 629 = 3774
Step 7: 3774 + 629 = 4403
Step 8: 4403 + 629 = 5032
Step 9: 5032 + 629 = 5661
Step 10: 5661 + 629 = 6290
Step 11: 6290 + 629 = 6919
Step 12: 6919 + 629 = 7548
Step 13: 7548 + 629 = 8177

So, 629*13 = 8177