Without delay, let's solve this. We've got 131 and we will be multiplying it by 31, that is, adding 131 to itself 31 times.
Step 1: 0 + 131 = 131
Step 2: 131 + 131 = 262
Step 3: 262 + 131 = 393
Step 4: 393 + 131 = 524
Step 5: 524 + 131 = 655
Step 6: 655 + 131 = 786
Step 7: 786 + 131 = 917
Step 8: 917 + 131 = 1048
Step 9: 1048 + 131 = 1179
Step 10: 1179 + 131 = 1310
Step 11: 1310 + 131 = 1441
Step 12: 1441 + 131 = 1572
Step 13: 1572 + 131 = 1703
Step 14: 1703 + 131 = 1834
Step 15: 1834 + 131 = 1965
Step 16: 1965 + 131 = 2096
Step 17: 2096 + 131 = 2227
Step 18: 2227 + 131 = 2358
Step 19: 2358 + 131 = 2489
Step 20: 2489 + 131 = 2620
Step 21: 2620 + 131 = 2751
Step 22: 2751 + 131 = 2882
Step 23: 2882 + 131 = 3013
Step 24: 3013 + 131 = 3144
Step 25: 3144 + 131 = 3275
Step 26: 3275 + 131 = 3406
Step 27: 3406 + 131 = 3537
Step 28: 3537 + 131 = 3668
Step 29: 3668 + 131 = 3799
Step 30: 3799 + 131 = 3930
Step 31: 3930 + 131 = 4061

So, 131*31 = 4061