OK, let's crack this. We're given 687 and our task is to multiply it by 83. Essentially, we'll be adding 687 to itself 83 times.
Step 1: 0 + 687 = 687
Step 2: 687 + 687 = 1374
Step 3: 1374 + 687 = 2061
Step 4: 2061 + 687 = 2748
Step 5: 2748 + 687 = 3435
Step 6: 3435 + 687 = 4122
Step 7: 4122 + 687 = 4809
Step 8: 4809 + 687 = 5496
Step 9: 5496 + 687 = 6183
Step 10: 6183 + 687 = 6870
Step 11: 6870 + 687 = 7557
Step 12: 7557 + 687 = 8244
Step 13: 8244 + 687 = 8931
Step 14: 8931 + 687 = 9618
Step 15: 9618 + 687 = 10305
Step 16: 10305 + 687 = 10992
Step 17: 10992 + 687 = 11679
Step 18: 11679 + 687 = 12366
Step 19: 12366 + 687 = 13053
Step 20: 13053 + 687 = 13740
Step 21: 13740 + 687 = 14427
Step 22: 14427 + 687 = 15114
Step 23: 15114 + 687 = 15801
Step 24: 15801 + 687 = 16488
Step 25: 16488 + 687 = 17175
Step 26: 17175 + 687 = 17862
Step 27: 17862 + 687 = 18549
Step 28: 18549 + 687 = 19236
Step 29: 19236 + 687 = 19923
Step 30: 19923 + 687 = 20610
Step 31: 20610 + 687 = 21297
Step 32: 21297 + 687 = 21984
Step 33: 21984 + 687 = 22671
Step 34: 22671 + 687 = 23358
Step 35: 23358 + 687 = 24045
Step 36: 24045 + 687 = 24732
Step 37: 24732 + 687 = 25419
Step 38: 25419 + 687 = 26106
Step 39: 26106 + 687 = 26793
Step 40: 26793 + 687 = 27480
Step 41: 27480 + 687 = 28167
Step 42: 28167 + 687 = 28854
Step 43: 28854 + 687 = 29541
Step 44: 29541 + 687 = 30228
Step 45: 30228 + 687 = 30915
Step 46: 30915 + 687 = 31602
Step 47: 31602 + 687 = 32289
Step 48: 32289 + 687 = 32976
Step 49: 32976 + 687 = 33663
Step 50: 33663 + 687 = 34350
Step 51: 34350 + 687 = 35037
Step 52: 35037 + 687 = 35724
Step 53: 35724 + 687 = 36411
Step 54: 36411 + 687 = 37098
Step 55: 37098 + 687 = 37785
Step 56: 37785 + 687 = 38472
Step 57: 38472 + 687 = 39159
Step 58: 39159 + 687 = 39846
Step 59: 39846 + 687 = 40533
Step 60: 40533 + 687 = 41220
Step 61: 41220 + 687 = 41907
Step 62: 41907 + 687 = 42594
Step 63: 42594 + 687 = 43281
Step 64: 43281 + 687 = 43968
Step 65: 43968 + 687 = 44655
Step 66: 44655 + 687 = 45342
Step 67: 45342 + 687 = 46029
Step 68: 46029 + 687 = 46716
Step 69: 46716 + 687 = 47403
Step 70: 47403 + 687 = 48090
Step 71: 48090 + 687 = 48777
Step 72: 48777 + 687 = 49464
Step 73: 49464 + 687 = 50151
Step 74: 50151 + 687 = 50838
Step 75: 50838 + 687 = 51525
Step 76: 51525 + 687 = 52212
Step 77: 52212 + 687 = 52899
Step 78: 52899 + 687 = 53586
Step 79: 53586 + 687 = 54273
Step 80: 54273 + 687 = 54960
Step 81: 54960 + 687 = 55647
Step 82: 55647 + 687 = 56334
Step 83: 56334 + 687 = 57021

So, 687*83 = 57021