Without delay, let's solve this. We've got 634 and we will be multiplying it by 4, that is, adding 634 to itself 4 times.
Step 1: 0 + 634 = 634
Step 2: 634 + 634 = 1268
Step 3: 1268 + 634 = 1902
Step 4: 1902 + 634 = 2536

So, 634*4 = 2536