Alright, let's solve this math problem step by step. First, we have the number 31. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 91. So, we're going to take the number 31 and add it to itself 91 times.
Step 1: 0 + 31 = 31
Step 2: 31 + 31 = 62
Step 3: 62 + 31 = 93
Step 4: 93 + 31 = 124
Step 5: 124 + 31 = 155
Step 6: 155 + 31 = 186
Step 7: 186 + 31 = 217
Step 8: 217 + 31 = 248
Step 9: 248 + 31 = 279
Step 10: 279 + 31 = 310
Step 11: 310 + 31 = 341
Step 12: 341 + 31 = 372
Step 13: 372 + 31 = 403
Step 14: 403 + 31 = 434
Step 15: 434 + 31 = 465
Step 16: 465 + 31 = 496
Step 17: 496 + 31 = 527
Step 18: 527 + 31 = 558
Step 19: 558 + 31 = 589
Step 20: 589 + 31 = 620
Step 21: 620 + 31 = 651
Step 22: 651 + 31 = 682
Step 23: 682 + 31 = 713
Step 24: 713 + 31 = 744
Step 25: 744 + 31 = 775
Step 26: 775 + 31 = 806
Step 27: 806 + 31 = 837
Step 28: 837 + 31 = 868
Step 29: 868 + 31 = 899
Step 30: 899 + 31 = 930
Step 31: 930 + 31 = 961
Step 32: 961 + 31 = 992
Step 33: 992 + 31 = 1023
Step 34: 1023 + 31 = 1054
Step 35: 1054 + 31 = 1085
Step 36: 1085 + 31 = 1116
Step 37: 1116 + 31 = 1147
Step 38: 1147 + 31 = 1178
Step 39: 1178 + 31 = 1209
Step 40: 1209 + 31 = 1240
Step 41: 1240 + 31 = 1271
Step 42: 1271 + 31 = 1302
Step 43: 1302 + 31 = 1333
Step 44: 1333 + 31 = 1364
Step 45: 1364 + 31 = 1395
Step 46: 1395 + 31 = 1426
Step 47: 1426 + 31 = 1457
Step 48: 1457 + 31 = 1488
Step 49: 1488 + 31 = 1519
Step 50: 1519 + 31 = 1550
Step 51: 1550 + 31 = 1581
Step 52: 1581 + 31 = 1612
Step 53: 1612 + 31 = 1643
Step 54: 1643 + 31 = 1674
Step 55: 1674 + 31 = 1705
Step 56: 1705 + 31 = 1736
Step 57: 1736 + 31 = 1767
Step 58: 1767 + 31 = 1798
Step 59: 1798 + 31 = 1829
Step 60: 1829 + 31 = 1860
Step 61: 1860 + 31 = 1891
Step 62: 1891 + 31 = 1922
Step 63: 1922 + 31 = 1953
Step 64: 1953 + 31 = 1984
Step 65: 1984 + 31 = 2015
Step 66: 2015 + 31 = 2046
Step 67: 2046 + 31 = 2077
Step 68: 2077 + 31 = 2108
Step 69: 2108 + 31 = 2139
Step 70: 2139 + 31 = 2170
Step 71: 2170 + 31 = 2201
Step 72: 2201 + 31 = 2232
Step 73: 2232 + 31 = 2263
Step 74: 2263 + 31 = 2294
Step 75: 2294 + 31 = 2325
Step 76: 2325 + 31 = 2356
Step 77: 2356 + 31 = 2387
Step 78: 2387 + 31 = 2418
Step 79: 2418 + 31 = 2449
Step 80: 2449 + 31 = 2480
Step 81: 2480 + 31 = 2511
Step 82: 2511 + 31 = 2542
Step 83: 2542 + 31 = 2573
Step 84: 2573 + 31 = 2604
Step 85: 2604 + 31 = 2635
Step 86: 2635 + 31 = 2666
Step 87: 2666 + 31 = 2697
Step 88: 2697 + 31 = 2728
Step 89: 2728 + 31 = 2759
Step 90: 2759 + 31 = 2790
Step 91: 2790 + 31 = 2821

So, 31*91 = 2821