OK, let's work through this together. We're starting with 619 and we're going to multiply it by 66, which means we add 619 to itself 66 times.
Step 1: 0 + 619 = 619
Step 2: 619 + 619 = 1238
Step 3: 1238 + 619 = 1857
Step 4: 1857 + 619 = 2476
Step 5: 2476 + 619 = 3095
Step 6: 3095 + 619 = 3714
Step 7: 3714 + 619 = 4333
Step 8: 4333 + 619 = 4952
Step 9: 4952 + 619 = 5571
Step 10: 5571 + 619 = 6190
Step 11: 6190 + 619 = 6809
Step 12: 6809 + 619 = 7428
Step 13: 7428 + 619 = 8047
Step 14: 8047 + 619 = 8666
Step 15: 8666 + 619 = 9285
Step 16: 9285 + 619 = 9904
Step 17: 9904 + 619 = 10523
Step 18: 10523 + 619 = 11142
Step 19: 11142 + 619 = 11761
Step 20: 11761 + 619 = 12380
Step 21: 12380 + 619 = 12999
Step 22: 12999 + 619 = 13618
Step 23: 13618 + 619 = 14237
Step 24: 14237 + 619 = 14856
Step 25: 14856 + 619 = 15475
Step 26: 15475 + 619 = 16094
Step 27: 16094 + 619 = 16713
Step 28: 16713 + 619 = 17332
Step 29: 17332 + 619 = 17951
Step 30: 17951 + 619 = 18570
Step 31: 18570 + 619 = 19189
Step 32: 19189 + 619 = 19808
Step 33: 19808 + 619 = 20427
Step 34: 20427 + 619 = 21046
Step 35: 21046 + 619 = 21665
Step 36: 21665 + 619 = 22284
Step 37: 22284 + 619 = 22903
Step 38: 22903 + 619 = 23522
Step 39: 23522 + 619 = 24141
Step 40: 24141 + 619 = 24760
Step 41: 24760 + 619 = 25379
Step 42: 25379 + 619 = 25998
Step 43: 25998 + 619 = 26617
Step 44: 26617 + 619 = 27236
Step 45: 27236 + 619 = 27855
Step 46: 27855 + 619 = 28474
Step 47: 28474 + 619 = 29093
Step 48: 29093 + 619 = 29712
Step 49: 29712 + 619 = 30331
Step 50: 30331 + 619 = 30950
Step 51: 30950 + 619 = 31569
Step 52: 31569 + 619 = 32188
Step 53: 32188 + 619 = 32807
Step 54: 32807 + 619 = 33426
Step 55: 33426 + 619 = 34045
Step 56: 34045 + 619 = 34664
Step 57: 34664 + 619 = 35283
Step 58: 35283 + 619 = 35902
Step 59: 35902 + 619 = 36521
Step 60: 36521 + 619 = 37140
Step 61: 37140 + 619 = 37759
Step 62: 37759 + 619 = 38378
Step 63: 38378 + 619 = 38997
Step 64: 38997 + 619 = 39616
Step 65: 39616 + 619 = 40235
Step 66: 40235 + 619 = 40854

So, 619*66 = 40854