OK, let's crack this. We're given 676 and our task is to multiply it by 87. Essentially, we'll be adding 676 to itself 87 times.
Step 1: 0 + 676 = 676
Step 2: 676 + 676 = 1352
Step 3: 1352 + 676 = 2028
Step 4: 2028 + 676 = 2704
Step 5: 2704 + 676 = 3380
Step 6: 3380 + 676 = 4056
Step 7: 4056 + 676 = 4732
Step 8: 4732 + 676 = 5408
Step 9: 5408 + 676 = 6084
Step 10: 6084 + 676 = 6760
Step 11: 6760 + 676 = 7436
Step 12: 7436 + 676 = 8112
Step 13: 8112 + 676 = 8788
Step 14: 8788 + 676 = 9464
Step 15: 9464 + 676 = 10140
Step 16: 10140 + 676 = 10816
Step 17: 10816 + 676 = 11492
Step 18: 11492 + 676 = 12168
Step 19: 12168 + 676 = 12844
Step 20: 12844 + 676 = 13520
Step 21: 13520 + 676 = 14196
Step 22: 14196 + 676 = 14872
Step 23: 14872 + 676 = 15548
Step 24: 15548 + 676 = 16224
Step 25: 16224 + 676 = 16900
Step 26: 16900 + 676 = 17576
Step 27: 17576 + 676 = 18252
Step 28: 18252 + 676 = 18928
Step 29: 18928 + 676 = 19604
Step 30: 19604 + 676 = 20280
Step 31: 20280 + 676 = 20956
Step 32: 20956 + 676 = 21632
Step 33: 21632 + 676 = 22308
Step 34: 22308 + 676 = 22984
Step 35: 22984 + 676 = 23660
Step 36: 23660 + 676 = 24336
Step 37: 24336 + 676 = 25012
Step 38: 25012 + 676 = 25688
Step 39: 25688 + 676 = 26364
Step 40: 26364 + 676 = 27040
Step 41: 27040 + 676 = 27716
Step 42: 27716 + 676 = 28392
Step 43: 28392 + 676 = 29068
Step 44: 29068 + 676 = 29744
Step 45: 29744 + 676 = 30420
Step 46: 30420 + 676 = 31096
Step 47: 31096 + 676 = 31772
Step 48: 31772 + 676 = 32448
Step 49: 32448 + 676 = 33124
Step 50: 33124 + 676 = 33800
Step 51: 33800 + 676 = 34476
Step 52: 34476 + 676 = 35152
Step 53: 35152 + 676 = 35828
Step 54: 35828 + 676 = 36504
Step 55: 36504 + 676 = 37180
Step 56: 37180 + 676 = 37856
Step 57: 37856 + 676 = 38532
Step 58: 38532 + 676 = 39208
Step 59: 39208 + 676 = 39884
Step 60: 39884 + 676 = 40560
Step 61: 40560 + 676 = 41236
Step 62: 41236 + 676 = 41912
Step 63: 41912 + 676 = 42588
Step 64: 42588 + 676 = 43264
Step 65: 43264 + 676 = 43940
Step 66: 43940 + 676 = 44616
Step 67: 44616 + 676 = 45292
Step 68: 45292 + 676 = 45968
Step 69: 45968 + 676 = 46644
Step 70: 46644 + 676 = 47320
Step 71: 47320 + 676 = 47996
Step 72: 47996 + 676 = 48672
Step 73: 48672 + 676 = 49348
Step 74: 49348 + 676 = 50024
Step 75: 50024 + 676 = 50700
Step 76: 50700 + 676 = 51376
Step 77: 51376 + 676 = 52052
Step 78: 52052 + 676 = 52728
Step 79: 52728 + 676 = 53404
Step 80: 53404 + 676 = 54080
Step 81: 54080 + 676 = 54756
Step 82: 54756 + 676 = 55432
Step 83: 55432 + 676 = 56108
Step 84: 56108 + 676 = 56784
Step 85: 56784 + 676 = 57460
Step 86: 57460 + 676 = 58136
Step 87: 58136 + 676 = 58812

So, 676*87 = 58812