Sure thing! We've got 648 and we're gonna multiply it by 41. That's the same as adding 648 to itself 41 times.
Step 1: 0 + 648 = 648
Step 2: 648 + 648 = 1296
Step 3: 1296 + 648 = 1944
Step 4: 1944 + 648 = 2592
Step 5: 2592 + 648 = 3240
Step 6: 3240 + 648 = 3888
Step 7: 3888 + 648 = 4536
Step 8: 4536 + 648 = 5184
Step 9: 5184 + 648 = 5832
Step 10: 5832 + 648 = 6480
Step 11: 6480 + 648 = 7128
Step 12: 7128 + 648 = 7776
Step 13: 7776 + 648 = 8424
Step 14: 8424 + 648 = 9072
Step 15: 9072 + 648 = 9720
Step 16: 9720 + 648 = 10368
Step 17: 10368 + 648 = 11016
Step 18: 11016 + 648 = 11664
Step 19: 11664 + 648 = 12312
Step 20: 12312 + 648 = 12960
Step 21: 12960 + 648 = 13608
Step 22: 13608 + 648 = 14256
Step 23: 14256 + 648 = 14904
Step 24: 14904 + 648 = 15552
Step 25: 15552 + 648 = 16200
Step 26: 16200 + 648 = 16848
Step 27: 16848 + 648 = 17496
Step 28: 17496 + 648 = 18144
Step 29: 18144 + 648 = 18792
Step 30: 18792 + 648 = 19440
Step 31: 19440 + 648 = 20088
Step 32: 20088 + 648 = 20736
Step 33: 20736 + 648 = 21384
Step 34: 21384 + 648 = 22032
Step 35: 22032 + 648 = 22680
Step 36: 22680 + 648 = 23328
Step 37: 23328 + 648 = 23976
Step 38: 23976 + 648 = 24624
Step 39: 24624 + 648 = 25272
Step 40: 25272 + 648 = 25920
Step 41: 25920 + 648 = 26568

So, 648*41 = 26568