Without delay, let's solve this. We've got 53 and we will be multiplying it by 15, that is, adding 53 to itself 15 times.
Step 1: 0 + 53 = 53
Step 2: 53 + 53 = 106
Step 3: 106 + 53 = 159
Step 4: 159 + 53 = 212
Step 5: 212 + 53 = 265
Step 6: 265 + 53 = 318
Step 7: 318 + 53 = 371
Step 8: 371 + 53 = 424
Step 9: 424 + 53 = 477
Step 10: 477 + 53 = 530
Step 11: 530 + 53 = 583
Step 12: 583 + 53 = 636
Step 13: 636 + 53 = 689
Step 14: 689 + 53 = 742
Step 15: 742 + 53 = 795

So, 53*15 = 795