OK, let's work through this together. We're starting with 273 and we're going to multiply it by 40, which means we add 273 to itself 40 times.
Step 1: 0 + 273 = 273
Step 2: 273 + 273 = 546
Step 3: 546 + 273 = 819
Step 4: 819 + 273 = 1092
Step 5: 1092 + 273 = 1365
Step 6: 1365 + 273 = 1638
Step 7: 1638 + 273 = 1911
Step 8: 1911 + 273 = 2184
Step 9: 2184 + 273 = 2457
Step 10: 2457 + 273 = 2730
Step 11: 2730 + 273 = 3003
Step 12: 3003 + 273 = 3276
Step 13: 3276 + 273 = 3549
Step 14: 3549 + 273 = 3822
Step 15: 3822 + 273 = 4095
Step 16: 4095 + 273 = 4368
Step 17: 4368 + 273 = 4641
Step 18: 4641 + 273 = 4914
Step 19: 4914 + 273 = 5187
Step 20: 5187 + 273 = 5460
Step 21: 5460 + 273 = 5733
Step 22: 5733 + 273 = 6006
Step 23: 6006 + 273 = 6279
Step 24: 6279 + 273 = 6552
Step 25: 6552 + 273 = 6825
Step 26: 6825 + 273 = 7098
Step 27: 7098 + 273 = 7371
Step 28: 7371 + 273 = 7644
Step 29: 7644 + 273 = 7917
Step 30: 7917 + 273 = 8190
Step 31: 8190 + 273 = 8463
Step 32: 8463 + 273 = 8736
Step 33: 8736 + 273 = 9009
Step 34: 9009 + 273 = 9282
Step 35: 9282 + 273 = 9555
Step 36: 9555 + 273 = 9828
Step 37: 9828 + 273 = 10101
Step 38: 10101 + 273 = 10374
Step 39: 10374 + 273 = 10647
Step 40: 10647 + 273 = 10920

So, 273*40 = 10920