Sure thing, let's get straight to it. We start with 856 and we're going to multiply it by 78, which means adding 856 to itself 78 times.
Step 1: 0 + 856 = 856
Step 2: 856 + 856 = 1712
Step 3: 1712 + 856 = 2568
Step 4: 2568 + 856 = 3424
Step 5: 3424 + 856 = 4280
Step 6: 4280 + 856 = 5136
Step 7: 5136 + 856 = 5992
Step 8: 5992 + 856 = 6848
Step 9: 6848 + 856 = 7704
Step 10: 7704 + 856 = 8560
Step 11: 8560 + 856 = 9416
Step 12: 9416 + 856 = 10272
Step 13: 10272 + 856 = 11128
Step 14: 11128 + 856 = 11984
Step 15: 11984 + 856 = 12840
Step 16: 12840 + 856 = 13696
Step 17: 13696 + 856 = 14552
Step 18: 14552 + 856 = 15408
Step 19: 15408 + 856 = 16264
Step 20: 16264 + 856 = 17120
Step 21: 17120 + 856 = 17976
Step 22: 17976 + 856 = 18832
Step 23: 18832 + 856 = 19688
Step 24: 19688 + 856 = 20544
Step 25: 20544 + 856 = 21400
Step 26: 21400 + 856 = 22256
Step 27: 22256 + 856 = 23112
Step 28: 23112 + 856 = 23968
Step 29: 23968 + 856 = 24824
Step 30: 24824 + 856 = 25680
Step 31: 25680 + 856 = 26536
Step 32: 26536 + 856 = 27392
Step 33: 27392 + 856 = 28248
Step 34: 28248 + 856 = 29104
Step 35: 29104 + 856 = 29960
Step 36: 29960 + 856 = 30816
Step 37: 30816 + 856 = 31672
Step 38: 31672 + 856 = 32528
Step 39: 32528 + 856 = 33384
Step 40: 33384 + 856 = 34240
Step 41: 34240 + 856 = 35096
Step 42: 35096 + 856 = 35952
Step 43: 35952 + 856 = 36808
Step 44: 36808 + 856 = 37664
Step 45: 37664 + 856 = 38520
Step 46: 38520 + 856 = 39376
Step 47: 39376 + 856 = 40232
Step 48: 40232 + 856 = 41088
Step 49: 41088 + 856 = 41944
Step 50: 41944 + 856 = 42800
Step 51: 42800 + 856 = 43656
Step 52: 43656 + 856 = 44512
Step 53: 44512 + 856 = 45368
Step 54: 45368 + 856 = 46224
Step 55: 46224 + 856 = 47080
Step 56: 47080 + 856 = 47936
Step 57: 47936 + 856 = 48792
Step 58: 48792 + 856 = 49648
Step 59: 49648 + 856 = 50504
Step 60: 50504 + 856 = 51360
Step 61: 51360 + 856 = 52216
Step 62: 52216 + 856 = 53072
Step 63: 53072 + 856 = 53928
Step 64: 53928 + 856 = 54784
Step 65: 54784 + 856 = 55640
Step 66: 55640 + 856 = 56496
Step 67: 56496 + 856 = 57352
Step 68: 57352 + 856 = 58208
Step 69: 58208 + 856 = 59064
Step 70: 59064 + 856 = 59920
Step 71: 59920 + 856 = 60776
Step 72: 60776 + 856 = 61632
Step 73: 61632 + 856 = 62488
Step 74: 62488 + 856 = 63344
Step 75: 63344 + 856 = 64200
Step 76: 64200 + 856 = 65056
Step 77: 65056 + 856 = 65912
Step 78: 65912 + 856 = 66768

So, 856*78 = 66768