Without delay, let's solve this. We've got 56 and we will be multiplying it by 15, that is, adding 56 to itself 15 times.
Step 1: 0 + 56 = 56
Step 2: 56 + 56 = 112
Step 3: 112 + 56 = 168
Step 4: 168 + 56 = 224
Step 5: 224 + 56 = 280
Step 6: 280 + 56 = 336
Step 7: 336 + 56 = 392
Step 8: 392 + 56 = 448
Step 9: 448 + 56 = 504
Step 10: 504 + 56 = 560
Step 11: 560 + 56 = 616
Step 12: 616 + 56 = 672
Step 13: 672 + 56 = 728
Step 14: 728 + 56 = 784
Step 15: 784 + 56 = 840

So, 56*15 = 840