OK, let's crack this. We're given 82 and our task is to multiply it by 90. Essentially, we'll be adding 82 to itself 90 times.
Step 1: 0 + 82 = 82
Step 2: 82 + 82 = 164
Step 3: 164 + 82 = 246
Step 4: 246 + 82 = 328
Step 5: 328 + 82 = 410
Step 6: 410 + 82 = 492
Step 7: 492 + 82 = 574
Step 8: 574 + 82 = 656
Step 9: 656 + 82 = 738
Step 10: 738 + 82 = 820
Step 11: 820 + 82 = 902
Step 12: 902 + 82 = 984
Step 13: 984 + 82 = 1066
Step 14: 1066 + 82 = 1148
Step 15: 1148 + 82 = 1230
Step 16: 1230 + 82 = 1312
Step 17: 1312 + 82 = 1394
Step 18: 1394 + 82 = 1476
Step 19: 1476 + 82 = 1558
Step 20: 1558 + 82 = 1640
Step 21: 1640 + 82 = 1722
Step 22: 1722 + 82 = 1804
Step 23: 1804 + 82 = 1886
Step 24: 1886 + 82 = 1968
Step 25: 1968 + 82 = 2050
Step 26: 2050 + 82 = 2132
Step 27: 2132 + 82 = 2214
Step 28: 2214 + 82 = 2296
Step 29: 2296 + 82 = 2378
Step 30: 2378 + 82 = 2460
Step 31: 2460 + 82 = 2542
Step 32: 2542 + 82 = 2624
Step 33: 2624 + 82 = 2706
Step 34: 2706 + 82 = 2788
Step 35: 2788 + 82 = 2870
Step 36: 2870 + 82 = 2952
Step 37: 2952 + 82 = 3034
Step 38: 3034 + 82 = 3116
Step 39: 3116 + 82 = 3198
Step 40: 3198 + 82 = 3280
Step 41: 3280 + 82 = 3362
Step 42: 3362 + 82 = 3444
Step 43: 3444 + 82 = 3526
Step 44: 3526 + 82 = 3608
Step 45: 3608 + 82 = 3690
Step 46: 3690 + 82 = 3772
Step 47: 3772 + 82 = 3854
Step 48: 3854 + 82 = 3936
Step 49: 3936 + 82 = 4018
Step 50: 4018 + 82 = 4100
Step 51: 4100 + 82 = 4182
Step 52: 4182 + 82 = 4264
Step 53: 4264 + 82 = 4346
Step 54: 4346 + 82 = 4428
Step 55: 4428 + 82 = 4510
Step 56: 4510 + 82 = 4592
Step 57: 4592 + 82 = 4674
Step 58: 4674 + 82 = 4756
Step 59: 4756 + 82 = 4838
Step 60: 4838 + 82 = 4920
Step 61: 4920 + 82 = 5002
Step 62: 5002 + 82 = 5084
Step 63: 5084 + 82 = 5166
Step 64: 5166 + 82 = 5248
Step 65: 5248 + 82 = 5330
Step 66: 5330 + 82 = 5412
Step 67: 5412 + 82 = 5494
Step 68: 5494 + 82 = 5576
Step 69: 5576 + 82 = 5658
Step 70: 5658 + 82 = 5740
Step 71: 5740 + 82 = 5822
Step 72: 5822 + 82 = 5904
Step 73: 5904 + 82 = 5986
Step 74: 5986 + 82 = 6068
Step 75: 6068 + 82 = 6150
Step 76: 6150 + 82 = 6232
Step 77: 6232 + 82 = 6314
Step 78: 6314 + 82 = 6396
Step 79: 6396 + 82 = 6478
Step 80: 6478 + 82 = 6560
Step 81: 6560 + 82 = 6642
Step 82: 6642 + 82 = 6724
Step 83: 6724 + 82 = 6806
Step 84: 6806 + 82 = 6888
Step 85: 6888 + 82 = 6970
Step 86: 6970 + 82 = 7052
Step 87: 7052 + 82 = 7134
Step 88: 7134 + 82 = 7216
Step 89: 7216 + 82 = 7298
Step 90: 7298 + 82 = 7380

So, 82*90 = 7380