OK, let's work through this together. We're starting with 105 and we're going to multiply it by 6, which means we add 105 to itself 6 times.
Step 1: 0 + 105 = 105
Step 2: 105 + 105 = 210
Step 3: 210 + 105 = 315
Step 4: 315 + 105 = 420
Step 5: 420 + 105 = 525
Step 6: 525 + 105 = 630

So, 105*6 = 630