OK, let's crack this. We're given 757 and our task is to multiply it by 31. Essentially, we'll be adding 757 to itself 31 times.
Step 1: 0 + 757 = 757
Step 2: 757 + 757 = 1514
Step 3: 1514 + 757 = 2271
Step 4: 2271 + 757 = 3028
Step 5: 3028 + 757 = 3785
Step 6: 3785 + 757 = 4542
Step 7: 4542 + 757 = 5299
Step 8: 5299 + 757 = 6056
Step 9: 6056 + 757 = 6813
Step 10: 6813 + 757 = 7570
Step 11: 7570 + 757 = 8327
Step 12: 8327 + 757 = 9084
Step 13: 9084 + 757 = 9841
Step 14: 9841 + 757 = 10598
Step 15: 10598 + 757 = 11355
Step 16: 11355 + 757 = 12112
Step 17: 12112 + 757 = 12869
Step 18: 12869 + 757 = 13626
Step 19: 13626 + 757 = 14383
Step 20: 14383 + 757 = 15140
Step 21: 15140 + 757 = 15897
Step 22: 15897 + 757 = 16654
Step 23: 16654 + 757 = 17411
Step 24: 17411 + 757 = 18168
Step 25: 18168 + 757 = 18925
Step 26: 18925 + 757 = 19682
Step 27: 19682 + 757 = 20439
Step 28: 20439 + 757 = 21196
Step 29: 21196 + 757 = 21953
Step 30: 21953 + 757 = 22710
Step 31: 22710 + 757 = 23467

So, 757*31 = 23467