OK, let's crack this. We're given 833 and our task is to multiply it by 78. Essentially, we'll be adding 833 to itself 78 times.
Step 1: 0 + 833 = 833
Step 2: 833 + 833 = 1666
Step 3: 1666 + 833 = 2499
Step 4: 2499 + 833 = 3332
Step 5: 3332 + 833 = 4165
Step 6: 4165 + 833 = 4998
Step 7: 4998 + 833 = 5831
Step 8: 5831 + 833 = 6664
Step 9: 6664 + 833 = 7497
Step 10: 7497 + 833 = 8330
Step 11: 8330 + 833 = 9163
Step 12: 9163 + 833 = 9996
Step 13: 9996 + 833 = 10829
Step 14: 10829 + 833 = 11662
Step 15: 11662 + 833 = 12495
Step 16: 12495 + 833 = 13328
Step 17: 13328 + 833 = 14161
Step 18: 14161 + 833 = 14994
Step 19: 14994 + 833 = 15827
Step 20: 15827 + 833 = 16660
Step 21: 16660 + 833 = 17493
Step 22: 17493 + 833 = 18326
Step 23: 18326 + 833 = 19159
Step 24: 19159 + 833 = 19992
Step 25: 19992 + 833 = 20825
Step 26: 20825 + 833 = 21658
Step 27: 21658 + 833 = 22491
Step 28: 22491 + 833 = 23324
Step 29: 23324 + 833 = 24157
Step 30: 24157 + 833 = 24990
Step 31: 24990 + 833 = 25823
Step 32: 25823 + 833 = 26656
Step 33: 26656 + 833 = 27489
Step 34: 27489 + 833 = 28322
Step 35: 28322 + 833 = 29155
Step 36: 29155 + 833 = 29988
Step 37: 29988 + 833 = 30821
Step 38: 30821 + 833 = 31654
Step 39: 31654 + 833 = 32487
Step 40: 32487 + 833 = 33320
Step 41: 33320 + 833 = 34153
Step 42: 34153 + 833 = 34986
Step 43: 34986 + 833 = 35819
Step 44: 35819 + 833 = 36652
Step 45: 36652 + 833 = 37485
Step 46: 37485 + 833 = 38318
Step 47: 38318 + 833 = 39151
Step 48: 39151 + 833 = 39984
Step 49: 39984 + 833 = 40817
Step 50: 40817 + 833 = 41650
Step 51: 41650 + 833 = 42483
Step 52: 42483 + 833 = 43316
Step 53: 43316 + 833 = 44149
Step 54: 44149 + 833 = 44982
Step 55: 44982 + 833 = 45815
Step 56: 45815 + 833 = 46648
Step 57: 46648 + 833 = 47481
Step 58: 47481 + 833 = 48314
Step 59: 48314 + 833 = 49147
Step 60: 49147 + 833 = 49980
Step 61: 49980 + 833 = 50813
Step 62: 50813 + 833 = 51646
Step 63: 51646 + 833 = 52479
Step 64: 52479 + 833 = 53312
Step 65: 53312 + 833 = 54145
Step 66: 54145 + 833 = 54978
Step 67: 54978 + 833 = 55811
Step 68: 55811 + 833 = 56644
Step 69: 56644 + 833 = 57477
Step 70: 57477 + 833 = 58310
Step 71: 58310 + 833 = 59143
Step 72: 59143 + 833 = 59976
Step 73: 59976 + 833 = 60809
Step 74: 60809 + 833 = 61642
Step 75: 61642 + 833 = 62475
Step 76: 62475 + 833 = 63308
Step 77: 63308 + 833 = 64141
Step 78: 64141 + 833 = 64974

So, 833*78 = 64974