Let's roll up our sleeves and solve this. We have 816 and we're going to multiply it by 67, essentially adding 816 to itself 67 times.
Step 1: 0 + 816 = 816
Step 2: 816 + 816 = 1632
Step 3: 1632 + 816 = 2448
Step 4: 2448 + 816 = 3264
Step 5: 3264 + 816 = 4080
Step 6: 4080 + 816 = 4896
Step 7: 4896 + 816 = 5712
Step 8: 5712 + 816 = 6528
Step 9: 6528 + 816 = 7344
Step 10: 7344 + 816 = 8160
Step 11: 8160 + 816 = 8976
Step 12: 8976 + 816 = 9792
Step 13: 9792 + 816 = 10608
Step 14: 10608 + 816 = 11424
Step 15: 11424 + 816 = 12240
Step 16: 12240 + 816 = 13056
Step 17: 13056 + 816 = 13872
Step 18: 13872 + 816 = 14688
Step 19: 14688 + 816 = 15504
Step 20: 15504 + 816 = 16320
Step 21: 16320 + 816 = 17136
Step 22: 17136 + 816 = 17952
Step 23: 17952 + 816 = 18768
Step 24: 18768 + 816 = 19584
Step 25: 19584 + 816 = 20400
Step 26: 20400 + 816 = 21216
Step 27: 21216 + 816 = 22032
Step 28: 22032 + 816 = 22848
Step 29: 22848 + 816 = 23664
Step 30: 23664 + 816 = 24480
Step 31: 24480 + 816 = 25296
Step 32: 25296 + 816 = 26112
Step 33: 26112 + 816 = 26928
Step 34: 26928 + 816 = 27744
Step 35: 27744 + 816 = 28560
Step 36: 28560 + 816 = 29376
Step 37: 29376 + 816 = 30192
Step 38: 30192 + 816 = 31008
Step 39: 31008 + 816 = 31824
Step 40: 31824 + 816 = 32640
Step 41: 32640 + 816 = 33456
Step 42: 33456 + 816 = 34272
Step 43: 34272 + 816 = 35088
Step 44: 35088 + 816 = 35904
Step 45: 35904 + 816 = 36720
Step 46: 36720 + 816 = 37536
Step 47: 37536 + 816 = 38352
Step 48: 38352 + 816 = 39168
Step 49: 39168 + 816 = 39984
Step 50: 39984 + 816 = 40800
Step 51: 40800 + 816 = 41616
Step 52: 41616 + 816 = 42432
Step 53: 42432 + 816 = 43248
Step 54: 43248 + 816 = 44064
Step 55: 44064 + 816 = 44880
Step 56: 44880 + 816 = 45696
Step 57: 45696 + 816 = 46512
Step 58: 46512 + 816 = 47328
Step 59: 47328 + 816 = 48144
Step 60: 48144 + 816 = 48960
Step 61: 48960 + 816 = 49776
Step 62: 49776 + 816 = 50592
Step 63: 50592 + 816 = 51408
Step 64: 51408 + 816 = 52224
Step 65: 52224 + 816 = 53040
Step 66: 53040 + 816 = 53856
Step 67: 53856 + 816 = 54672

So, 816*67 = 54672