Without delay, let's solve this. We've got 848 and we will be multiplying it by 20, that is, adding 848 to itself 20 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
Step 16: 12720 + 848 = 13568
Step 17: 13568 + 848 = 14416
Step 18: 14416 + 848 = 15264
Step 19: 15264 + 848 = 16112
Step 20: 16112 + 848 = 16960

So, 848*20 = 16960