OK, let's work through this together. We're starting with 726 and we're going to multiply it by 31, which means we add 726 to itself 31 times.
Step 1: 0 + 726 = 726
Step 2: 726 + 726 = 1452
Step 3: 1452 + 726 = 2178
Step 4: 2178 + 726 = 2904
Step 5: 2904 + 726 = 3630
Step 6: 3630 + 726 = 4356
Step 7: 4356 + 726 = 5082
Step 8: 5082 + 726 = 5808
Step 9: 5808 + 726 = 6534
Step 10: 6534 + 726 = 7260
Step 11: 7260 + 726 = 7986
Step 12: 7986 + 726 = 8712
Step 13: 8712 + 726 = 9438
Step 14: 9438 + 726 = 10164
Step 15: 10164 + 726 = 10890
Step 16: 10890 + 726 = 11616
Step 17: 11616 + 726 = 12342
Step 18: 12342 + 726 = 13068
Step 19: 13068 + 726 = 13794
Step 20: 13794 + 726 = 14520
Step 21: 14520 + 726 = 15246
Step 22: 15246 + 726 = 15972
Step 23: 15972 + 726 = 16698
Step 24: 16698 + 726 = 17424
Step 25: 17424 + 726 = 18150
Step 26: 18150 + 726 = 18876
Step 27: 18876 + 726 = 19602
Step 28: 19602 + 726 = 20328
Step 29: 20328 + 726 = 21054
Step 30: 21054 + 726 = 21780
Step 31: 21780 + 726 = 22506

So, 726*31 = 22506