OK, let's work through this together. We're starting with 495 and we're going to multiply it by 15, which means we add 495 to itself 15 times.
Step 1: 0 + 495 = 495
Step 2: 495 + 495 = 990
Step 3: 990 + 495 = 1485
Step 4: 1485 + 495 = 1980
Step 5: 1980 + 495 = 2475
Step 6: 2475 + 495 = 2970
Step 7: 2970 + 495 = 3465
Step 8: 3465 + 495 = 3960
Step 9: 3960 + 495 = 4455
Step 10: 4455 + 495 = 4950
Step 11: 4950 + 495 = 5445
Step 12: 5445 + 495 = 5940
Step 13: 5940 + 495 = 6435
Step 14: 6435 + 495 = 6930
Step 15: 6930 + 495 = 7425

So, 495*15 = 7425