Let's get this math done. We have 731 and we're going to multiply it by 31. This is the same as taking 731 and adding it to itself 31 times.
Step 1: 0 + 731 = 731
Step 2: 731 + 731 = 1462
Step 3: 1462 + 731 = 2193
Step 4: 2193 + 731 = 2924
Step 5: 2924 + 731 = 3655
Step 6: 3655 + 731 = 4386
Step 7: 4386 + 731 = 5117
Step 8: 5117 + 731 = 5848
Step 9: 5848 + 731 = 6579
Step 10: 6579 + 731 = 7310
Step 11: 7310 + 731 = 8041
Step 12: 8041 + 731 = 8772
Step 13: 8772 + 731 = 9503
Step 14: 9503 + 731 = 10234
Step 15: 10234 + 731 = 10965
Step 16: 10965 + 731 = 11696
Step 17: 11696 + 731 = 12427
Step 18: 12427 + 731 = 13158
Step 19: 13158 + 731 = 13889
Step 20: 13889 + 731 = 14620
Step 21: 14620 + 731 = 15351
Step 22: 15351 + 731 = 16082
Step 23: 16082 + 731 = 16813
Step 24: 16813 + 731 = 17544
Step 25: 17544 + 731 = 18275
Step 26: 18275 + 731 = 19006
Step 27: 19006 + 731 = 19737
Step 28: 19737 + 731 = 20468
Step 29: 20468 + 731 = 21199
Step 30: 21199 + 731 = 21930
Step 31: 21930 + 731 = 22661

So, 731*31 = 22661