Sure thing! We've got 858 and we're gonna multiply it by 115. That's the same as adding 858 to itself 115 times.
Step 1: 0 + 858 = 858
Step 2: 858 + 858 = 1716
Step 3: 1716 + 858 = 2574
Step 4: 2574 + 858 = 3432
Step 5: 3432 + 858 = 4290
Step 6: 4290 + 858 = 5148
Step 7: 5148 + 858 = 6006
Step 8: 6006 + 858 = 6864
Step 9: 6864 + 858 = 7722
Step 10: 7722 + 858 = 8580
Step 11: 8580 + 858 = 9438
Step 12: 9438 + 858 = 10296
Step 13: 10296 + 858 = 11154
Step 14: 11154 + 858 = 12012
Step 15: 12012 + 858 = 12870
Step 16: 12870 + 858 = 13728
Step 17: 13728 + 858 = 14586
Step 18: 14586 + 858 = 15444
Step 19: 15444 + 858 = 16302
Step 20: 16302 + 858 = 17160
Step 21: 17160 + 858 = 18018
Step 22: 18018 + 858 = 18876
Step 23: 18876 + 858 = 19734
Step 24: 19734 + 858 = 20592
Step 25: 20592 + 858 = 21450
Step 26: 21450 + 858 = 22308
Step 27: 22308 + 858 = 23166
Step 28: 23166 + 858 = 24024
Step 29: 24024 + 858 = 24882
Step 30: 24882 + 858 = 25740
Step 31: 25740 + 858 = 26598
Step 32: 26598 + 858 = 27456
Step 33: 27456 + 858 = 28314
Step 34: 28314 + 858 = 29172
Step 35: 29172 + 858 = 30030
Step 36: 30030 + 858 = 30888
Step 37: 30888 + 858 = 31746
Step 38: 31746 + 858 = 32604
Step 39: 32604 + 858 = 33462
Step 40: 33462 + 858 = 34320
Step 41: 34320 + 858 = 35178
Step 42: 35178 + 858 = 36036
Step 43: 36036 + 858 = 36894
Step 44: 36894 + 858 = 37752
Step 45: 37752 + 858 = 38610
Step 46: 38610 + 858 = 39468
Step 47: 39468 + 858 = 40326
Step 48: 40326 + 858 = 41184
Step 49: 41184 + 858 = 42042
Step 50: 42042 + 858 = 42900
Step 51: 42900 + 858 = 43758
Step 52: 43758 + 858 = 44616
Step 53: 44616 + 858 = 45474
Step 54: 45474 + 858 = 46332
Step 55: 46332 + 858 = 47190
Step 56: 47190 + 858 = 48048
Step 57: 48048 + 858 = 48906
Step 58: 48906 + 858 = 49764
Step 59: 49764 + 858 = 50622
Step 60: 50622 + 858 = 51480
Step 61: 51480 + 858 = 52338
Step 62: 52338 + 858 = 53196
Step 63: 53196 + 858 = 54054
Step 64: 54054 + 858 = 54912
Step 65: 54912 + 858 = 55770
Step 66: 55770 + 858 = 56628
Step 67: 56628 + 858 = 57486
Step 68: 57486 + 858 = 58344
Step 69: 58344 + 858 = 59202
Step 70: 59202 + 858 = 60060
Step 71: 60060 + 858 = 60918
Step 72: 60918 + 858 = 61776
Step 73: 61776 + 858 = 62634
Step 74: 62634 + 858 = 63492
Step 75: 63492 + 858 = 64350
Step 76: 64350 + 858 = 65208
Step 77: 65208 + 858 = 66066
Step 78: 66066 + 858 = 66924
Step 79: 66924 + 858 = 67782
Step 80: 67782 + 858 = 68640
Step 81: 68640 + 858 = 69498
Step 82: 69498 + 858 = 70356
Step 83: 70356 + 858 = 71214
Step 84: 71214 + 858 = 72072
Step 85: 72072 + 858 = 72930
Step 86: 72930 + 858 = 73788
Step 87: 73788 + 858 = 74646
Step 88: 74646 + 858 = 75504
Step 89: 75504 + 858 = 76362
Step 90: 76362 + 858 = 77220
Step 91: 77220 + 858 = 78078
Step 92: 78078 + 858 = 78936
Step 93: 78936 + 858 = 79794
Step 94: 79794 + 858 = 80652
Step 95: 80652 + 858 = 81510
Step 96: 81510 + 858 = 82368
Step 97: 82368 + 858 = 83226
Step 98: 83226 + 858 = 84084
Step 99: 84084 + 858 = 84942
Step 100: 84942 + 858 = 85800
Step 101: 85800 + 858 = 86658
Step 102: 86658 + 858 = 87516
Step 103: 87516 + 858 = 88374
Step 104: 88374 + 858 = 89232
Step 105: 89232 + 858 = 90090
Step 106: 90090 + 858 = 90948
Step 107: 90948 + 858 = 91806
Step 108: 91806 + 858 = 92664
Step 109: 92664 + 858 = 93522
Step 110: 93522 + 858 = 94380
Step 111: 94380 + 858 = 95238
Step 112: 95238 + 858 = 96096
Step 113: 96096 + 858 = 96954
Step 114: 96954 + 858 = 97812
Step 115: 97812 + 858 = 98670

So, 858*115 = 98670