Let's get this math done. We have 797 and we're going to multiply it by 78. This is the same as taking 797 and adding it to itself 78 times.
Step 1: 0 + 797 = 797
Step 2: 797 + 797 = 1594
Step 3: 1594 + 797 = 2391
Step 4: 2391 + 797 = 3188
Step 5: 3188 + 797 = 3985
Step 6: 3985 + 797 = 4782
Step 7: 4782 + 797 = 5579
Step 8: 5579 + 797 = 6376
Step 9: 6376 + 797 = 7173
Step 10: 7173 + 797 = 7970
Step 11: 7970 + 797 = 8767
Step 12: 8767 + 797 = 9564
Step 13: 9564 + 797 = 10361
Step 14: 10361 + 797 = 11158
Step 15: 11158 + 797 = 11955
Step 16: 11955 + 797 = 12752
Step 17: 12752 + 797 = 13549
Step 18: 13549 + 797 = 14346
Step 19: 14346 + 797 = 15143
Step 20: 15143 + 797 = 15940
Step 21: 15940 + 797 = 16737
Step 22: 16737 + 797 = 17534
Step 23: 17534 + 797 = 18331
Step 24: 18331 + 797 = 19128
Step 25: 19128 + 797 = 19925
Step 26: 19925 + 797 = 20722
Step 27: 20722 + 797 = 21519
Step 28: 21519 + 797 = 22316
Step 29: 22316 + 797 = 23113
Step 30: 23113 + 797 = 23910
Step 31: 23910 + 797 = 24707
Step 32: 24707 + 797 = 25504
Step 33: 25504 + 797 = 26301
Step 34: 26301 + 797 = 27098
Step 35: 27098 + 797 = 27895
Step 36: 27895 + 797 = 28692
Step 37: 28692 + 797 = 29489
Step 38: 29489 + 797 = 30286
Step 39: 30286 + 797 = 31083
Step 40: 31083 + 797 = 31880
Step 41: 31880 + 797 = 32677
Step 42: 32677 + 797 = 33474
Step 43: 33474 + 797 = 34271
Step 44: 34271 + 797 = 35068
Step 45: 35068 + 797 = 35865
Step 46: 35865 + 797 = 36662
Step 47: 36662 + 797 = 37459
Step 48: 37459 + 797 = 38256
Step 49: 38256 + 797 = 39053
Step 50: 39053 + 797 = 39850
Step 51: 39850 + 797 = 40647
Step 52: 40647 + 797 = 41444
Step 53: 41444 + 797 = 42241
Step 54: 42241 + 797 = 43038
Step 55: 43038 + 797 = 43835
Step 56: 43835 + 797 = 44632
Step 57: 44632 + 797 = 45429
Step 58: 45429 + 797 = 46226
Step 59: 46226 + 797 = 47023
Step 60: 47023 + 797 = 47820
Step 61: 47820 + 797 = 48617
Step 62: 48617 + 797 = 49414
Step 63: 49414 + 797 = 50211
Step 64: 50211 + 797 = 51008
Step 65: 51008 + 797 = 51805
Step 66: 51805 + 797 = 52602
Step 67: 52602 + 797 = 53399
Step 68: 53399 + 797 = 54196
Step 69: 54196 + 797 = 54993
Step 70: 54993 + 797 = 55790
Step 71: 55790 + 797 = 56587
Step 72: 56587 + 797 = 57384
Step 73: 57384 + 797 = 58181
Step 74: 58181 + 797 = 58978
Step 75: 58978 + 797 = 59775
Step 76: 59775 + 797 = 60572
Step 77: 60572 + 797 = 61369
Step 78: 61369 + 797 = 62166

So, 797*78 = 62166