Let's roll up our sleeves and solve this. We have 366 and we're going to multiply it by 55, essentially adding 366 to itself 55 times.
Step 1: 0 + 366 = 366
Step 2: 366 + 366 = 732
Step 3: 732 + 366 = 1098
Step 4: 1098 + 366 = 1464
Step 5: 1464 + 366 = 1830
Step 6: 1830 + 366 = 2196
Step 7: 2196 + 366 = 2562
Step 8: 2562 + 366 = 2928
Step 9: 2928 + 366 = 3294
Step 10: 3294 + 366 = 3660
Step 11: 3660 + 366 = 4026
Step 12: 4026 + 366 = 4392
Step 13: 4392 + 366 = 4758
Step 14: 4758 + 366 = 5124
Step 15: 5124 + 366 = 5490
Step 16: 5490 + 366 = 5856
Step 17: 5856 + 366 = 6222
Step 18: 6222 + 366 = 6588
Step 19: 6588 + 366 = 6954
Step 20: 6954 + 366 = 7320
Step 21: 7320 + 366 = 7686
Step 22: 7686 + 366 = 8052
Step 23: 8052 + 366 = 8418
Step 24: 8418 + 366 = 8784
Step 25: 8784 + 366 = 9150
Step 26: 9150 + 366 = 9516
Step 27: 9516 + 366 = 9882
Step 28: 9882 + 366 = 10248
Step 29: 10248 + 366 = 10614
Step 30: 10614 + 366 = 10980
Step 31: 10980 + 366 = 11346
Step 32: 11346 + 366 = 11712
Step 33: 11712 + 366 = 12078
Step 34: 12078 + 366 = 12444
Step 35: 12444 + 366 = 12810
Step 36: 12810 + 366 = 13176
Step 37: 13176 + 366 = 13542
Step 38: 13542 + 366 = 13908
Step 39: 13908 + 366 = 14274
Step 40: 14274 + 366 = 14640
Step 41: 14640 + 366 = 15006
Step 42: 15006 + 366 = 15372
Step 43: 15372 + 366 = 15738
Step 44: 15738 + 366 = 16104
Step 45: 16104 + 366 = 16470
Step 46: 16470 + 366 = 16836
Step 47: 16836 + 366 = 17202
Step 48: 17202 + 366 = 17568
Step 49: 17568 + 366 = 17934
Step 50: 17934 + 366 = 18300
Step 51: 18300 + 366 = 18666
Step 52: 18666 + 366 = 19032
Step 53: 19032 + 366 = 19398
Step 54: 19398 + 366 = 19764
Step 55: 19764 + 366 = 20130

So, 366*55 = 20130