OK, let's work through this together. We're starting with 71 and we're going to multiply it by 71, which means we add 71 to itself 71 times.
Step 1: 0 + 71 = 71
Step 2: 71 + 71 = 142
Step 3: 142 + 71 = 213
Step 4: 213 + 71 = 284
Step 5: 284 + 71 = 355
Step 6: 355 + 71 = 426
Step 7: 426 + 71 = 497
Step 8: 497 + 71 = 568
Step 9: 568 + 71 = 639
Step 10: 639 + 71 = 710
Step 11: 710 + 71 = 781
Step 12: 781 + 71 = 852
Step 13: 852 + 71 = 923
Step 14: 923 + 71 = 994
Step 15: 994 + 71 = 1065
Step 16: 1065 + 71 = 1136
Step 17: 1136 + 71 = 1207
Step 18: 1207 + 71 = 1278
Step 19: 1278 + 71 = 1349
Step 20: 1349 + 71 = 1420
Step 21: 1420 + 71 = 1491
Step 22: 1491 + 71 = 1562
Step 23: 1562 + 71 = 1633
Step 24: 1633 + 71 = 1704
Step 25: 1704 + 71 = 1775
Step 26: 1775 + 71 = 1846
Step 27: 1846 + 71 = 1917
Step 28: 1917 + 71 = 1988
Step 29: 1988 + 71 = 2059
Step 30: 2059 + 71 = 2130
Step 31: 2130 + 71 = 2201
Step 32: 2201 + 71 = 2272
Step 33: 2272 + 71 = 2343
Step 34: 2343 + 71 = 2414
Step 35: 2414 + 71 = 2485
Step 36: 2485 + 71 = 2556
Step 37: 2556 + 71 = 2627
Step 38: 2627 + 71 = 2698
Step 39: 2698 + 71 = 2769
Step 40: 2769 + 71 = 2840
Step 41: 2840 + 71 = 2911
Step 42: 2911 + 71 = 2982
Step 43: 2982 + 71 = 3053
Step 44: 3053 + 71 = 3124
Step 45: 3124 + 71 = 3195
Step 46: 3195 + 71 = 3266
Step 47: 3266 + 71 = 3337
Step 48: 3337 + 71 = 3408
Step 49: 3408 + 71 = 3479
Step 50: 3479 + 71 = 3550
Step 51: 3550 + 71 = 3621
Step 52: 3621 + 71 = 3692
Step 53: 3692 + 71 = 3763
Step 54: 3763 + 71 = 3834
Step 55: 3834 + 71 = 3905
Step 56: 3905 + 71 = 3976
Step 57: 3976 + 71 = 4047
Step 58: 4047 + 71 = 4118
Step 59: 4118 + 71 = 4189
Step 60: 4189 + 71 = 4260
Step 61: 4260 + 71 = 4331
Step 62: 4331 + 71 = 4402
Step 63: 4402 + 71 = 4473
Step 64: 4473 + 71 = 4544
Step 65: 4544 + 71 = 4615
Step 66: 4615 + 71 = 4686
Step 67: 4686 + 71 = 4757
Step 68: 4757 + 71 = 4828
Step 69: 4828 + 71 = 4899
Step 70: 4899 + 71 = 4970
Step 71: 4970 + 71 = 5041

So, 71*71 = 5041