Sure thing, let's get straight to it. We start with 848 and we're going to multiply it by 15, which means adding 848 to itself 15 times.
Step 1: 0 + 848 = 848
Step 2: 848 + 848 = 1696
Step 3: 1696 + 848 = 2544
Step 4: 2544 + 848 = 3392
Step 5: 3392 + 848 = 4240
Step 6: 4240 + 848 = 5088
Step 7: 5088 + 848 = 5936
Step 8: 5936 + 848 = 6784
Step 9: 6784 + 848 = 7632
Step 10: 7632 + 848 = 8480
Step 11: 8480 + 848 = 9328
Step 12: 9328 + 848 = 10176
Step 13: 10176 + 848 = 11024
Step 14: 11024 + 848 = 11872
Step 15: 11872 + 848 = 12720

So, 848*15 = 12720