Without delay, let's solve this. We've got 315 and we will be multiplying it by 4, that is, adding 315 to itself 4 times.
Step 1: 0 + 315 = 315
Step 2: 315 + 315 = 630
Step 3: 630 + 315 = 945
Step 4: 945 + 315 = 1260

So, 315*4 = 1260