Without delay, let's solve this. We've got 538 and we will be multiplying it by 20, that is, adding 538 to itself 20 times.
Step 1: 0 + 538 = 538
Step 2: 538 + 538 = 1076
Step 3: 1076 + 538 = 1614
Step 4: 1614 + 538 = 2152
Step 5: 2152 + 538 = 2690
Step 6: 2690 + 538 = 3228
Step 7: 3228 + 538 = 3766
Step 8: 3766 + 538 = 4304
Step 9: 4304 + 538 = 4842
Step 10: 4842 + 538 = 5380
Step 11: 5380 + 538 = 5918
Step 12: 5918 + 538 = 6456
Step 13: 6456 + 538 = 6994
Step 14: 6994 + 538 = 7532
Step 15: 7532 + 538 = 8070
Step 16: 8070 + 538 = 8608
Step 17: 8608 + 538 = 9146
Step 18: 9146 + 538 = 9684
Step 19: 9684 + 538 = 10222
Step 20: 10222 + 538 = 10760

So, 538*20 = 10760