Let's get this math done. We have 89 and we're going to multiply it by 51. This is the same as taking 89 and adding it to itself 51 times.
Step 1: 0 + 89 = 89
Step 2: 89 + 89 = 178
Step 3: 178 + 89 = 267
Step 4: 267 + 89 = 356
Step 5: 356 + 89 = 445
Step 6: 445 + 89 = 534
Step 7: 534 + 89 = 623
Step 8: 623 + 89 = 712
Step 9: 712 + 89 = 801
Step 10: 801 + 89 = 890
Step 11: 890 + 89 = 979
Step 12: 979 + 89 = 1068
Step 13: 1068 + 89 = 1157
Step 14: 1157 + 89 = 1246
Step 15: 1246 + 89 = 1335
Step 16: 1335 + 89 = 1424
Step 17: 1424 + 89 = 1513
Step 18: 1513 + 89 = 1602
Step 19: 1602 + 89 = 1691
Step 20: 1691 + 89 = 1780
Step 21: 1780 + 89 = 1869
Step 22: 1869 + 89 = 1958
Step 23: 1958 + 89 = 2047
Step 24: 2047 + 89 = 2136
Step 25: 2136 + 89 = 2225
Step 26: 2225 + 89 = 2314
Step 27: 2314 + 89 = 2403
Step 28: 2403 + 89 = 2492
Step 29: 2492 + 89 = 2581
Step 30: 2581 + 89 = 2670
Step 31: 2670 + 89 = 2759
Step 32: 2759 + 89 = 2848
Step 33: 2848 + 89 = 2937
Step 34: 2937 + 89 = 3026
Step 35: 3026 + 89 = 3115
Step 36: 3115 + 89 = 3204
Step 37: 3204 + 89 = 3293
Step 38: 3293 + 89 = 3382
Step 39: 3382 + 89 = 3471
Step 40: 3471 + 89 = 3560
Step 41: 3560 + 89 = 3649
Step 42: 3649 + 89 = 3738
Step 43: 3738 + 89 = 3827
Step 44: 3827 + 89 = 3916
Step 45: 3916 + 89 = 4005
Step 46: 4005 + 89 = 4094
Step 47: 4094 + 89 = 4183
Step 48: 4183 + 89 = 4272
Step 49: 4272 + 89 = 4361
Step 50: 4361 + 89 = 4450
Step 51: 4450 + 89 = 4539

So, 89*51 = 4539