Let's get this math done. We have 315 and we're going to multiply it by 6. This is the same as taking 315 and adding it to itself 6 times.
Step 1: 0 + 315 = 315
Step 2: 315 + 315 = 630
Step 3: 630 + 315 = 945
Step 4: 945 + 315 = 1260
Step 5: 1260 + 315 = 1575
Step 6: 1575 + 315 = 1890

So, 315*6 = 1890