OK, let's work through this together. We're starting with 288 and we're going to multiply it by 54, which means we add 288 to itself 54 times.
Step 1: 0 + 288 = 288
Step 2: 288 + 288 = 576
Step 3: 576 + 288 = 864
Step 4: 864 + 288 = 1152
Step 5: 1152 + 288 = 1440
Step 6: 1440 + 288 = 1728
Step 7: 1728 + 288 = 2016
Step 8: 2016 + 288 = 2304
Step 9: 2304 + 288 = 2592
Step 10: 2592 + 288 = 2880
Step 11: 2880 + 288 = 3168
Step 12: 3168 + 288 = 3456
Step 13: 3456 + 288 = 3744
Step 14: 3744 + 288 = 4032
Step 15: 4032 + 288 = 4320
Step 16: 4320 + 288 = 4608
Step 17: 4608 + 288 = 4896
Step 18: 4896 + 288 = 5184
Step 19: 5184 + 288 = 5472
Step 20: 5472 + 288 = 5760
Step 21: 5760 + 288 = 6048
Step 22: 6048 + 288 = 6336
Step 23: 6336 + 288 = 6624
Step 24: 6624 + 288 = 6912
Step 25: 6912 + 288 = 7200
Step 26: 7200 + 288 = 7488
Step 27: 7488 + 288 = 7776
Step 28: 7776 + 288 = 8064
Step 29: 8064 + 288 = 8352
Step 30: 8352 + 288 = 8640
Step 31: 8640 + 288 = 8928
Step 32: 8928 + 288 = 9216
Step 33: 9216 + 288 = 9504
Step 34: 9504 + 288 = 9792
Step 35: 9792 + 288 = 10080
Step 36: 10080 + 288 = 10368
Step 37: 10368 + 288 = 10656
Step 38: 10656 + 288 = 10944
Step 39: 10944 + 288 = 11232
Step 40: 11232 + 288 = 11520
Step 41: 11520 + 288 = 11808
Step 42: 11808 + 288 = 12096
Step 43: 12096 + 288 = 12384
Step 44: 12384 + 288 = 12672
Step 45: 12672 + 288 = 12960
Step 46: 12960 + 288 = 13248
Step 47: 13248 + 288 = 13536
Step 48: 13536 + 288 = 13824
Step 49: 13824 + 288 = 14112
Step 50: 14112 + 288 = 14400
Step 51: 14400 + 288 = 14688
Step 52: 14688 + 288 = 14976
Step 53: 14976 + 288 = 15264
Step 54: 15264 + 288 = 15552

So, 288*54 = 15552