Without delay, let's solve this. We've got 83 and we will be multiplying it by 20, that is, adding 83 to itself 20 times.
Step 1: 0 + 83 = 83
Step 2: 83 + 83 = 166
Step 3: 166 + 83 = 249
Step 4: 249 + 83 = 332
Step 5: 332 + 83 = 415
Step 6: 415 + 83 = 498
Step 7: 498 + 83 = 581
Step 8: 581 + 83 = 664
Step 9: 664 + 83 = 747
Step 10: 747 + 83 = 830
Step 11: 830 + 83 = 913
Step 12: 913 + 83 = 996
Step 13: 996 + 83 = 1079
Step 14: 1079 + 83 = 1162
Step 15: 1162 + 83 = 1245
Step 16: 1245 + 83 = 1328
Step 17: 1328 + 83 = 1411
Step 18: 1411 + 83 = 1494
Step 19: 1494 + 83 = 1577
Step 20: 1577 + 83 = 1660

So, 83*20 = 1660