Let's roll up our sleeves and solve this. We have 634 and we're going to multiply it by 6, essentially adding 634 to itself 6 times.
Step 1: 0 + 634 = 634
Step 2: 634 + 634 = 1268
Step 3: 1268 + 634 = 1902
Step 4: 1902 + 634 = 2536
Step 5: 2536 + 634 = 3170
Step 6: 3170 + 634 = 3804

So, 634*6 = 3804