OK, let's crack this. We're given 324 and our task is to multiply it by 115. Essentially, we'll be adding 324 to itself 115 times.
Step 1: 0 + 324 = 324
Step 2: 324 + 324 = 648
Step 3: 648 + 324 = 972
Step 4: 972 + 324 = 1296
Step 5: 1296 + 324 = 1620
Step 6: 1620 + 324 = 1944
Step 7: 1944 + 324 = 2268
Step 8: 2268 + 324 = 2592
Step 9: 2592 + 324 = 2916
Step 10: 2916 + 324 = 3240
Step 11: 3240 + 324 = 3564
Step 12: 3564 + 324 = 3888
Step 13: 3888 + 324 = 4212
Step 14: 4212 + 324 = 4536
Step 15: 4536 + 324 = 4860
Step 16: 4860 + 324 = 5184
Step 17: 5184 + 324 = 5508
Step 18: 5508 + 324 = 5832
Step 19: 5832 + 324 = 6156
Step 20: 6156 + 324 = 6480
Step 21: 6480 + 324 = 6804
Step 22: 6804 + 324 = 7128
Step 23: 7128 + 324 = 7452
Step 24: 7452 + 324 = 7776
Step 25: 7776 + 324 = 8100
Step 26: 8100 + 324 = 8424
Step 27: 8424 + 324 = 8748
Step 28: 8748 + 324 = 9072
Step 29: 9072 + 324 = 9396
Step 30: 9396 + 324 = 9720
Step 31: 9720 + 324 = 10044
Step 32: 10044 + 324 = 10368
Step 33: 10368 + 324 = 10692
Step 34: 10692 + 324 = 11016
Step 35: 11016 + 324 = 11340
Step 36: 11340 + 324 = 11664
Step 37: 11664 + 324 = 11988
Step 38: 11988 + 324 = 12312
Step 39: 12312 + 324 = 12636
Step 40: 12636 + 324 = 12960
Step 41: 12960 + 324 = 13284
Step 42: 13284 + 324 = 13608
Step 43: 13608 + 324 = 13932
Step 44: 13932 + 324 = 14256
Step 45: 14256 + 324 = 14580
Step 46: 14580 + 324 = 14904
Step 47: 14904 + 324 = 15228
Step 48: 15228 + 324 = 15552
Step 49: 15552 + 324 = 15876
Step 50: 15876 + 324 = 16200
Step 51: 16200 + 324 = 16524
Step 52: 16524 + 324 = 16848
Step 53: 16848 + 324 = 17172
Step 54: 17172 + 324 = 17496
Step 55: 17496 + 324 = 17820
Step 56: 17820 + 324 = 18144
Step 57: 18144 + 324 = 18468
Step 58: 18468 + 324 = 18792
Step 59: 18792 + 324 = 19116
Step 60: 19116 + 324 = 19440
Step 61: 19440 + 324 = 19764
Step 62: 19764 + 324 = 20088
Step 63: 20088 + 324 = 20412
Step 64: 20412 + 324 = 20736
Step 65: 20736 + 324 = 21060
Step 66: 21060 + 324 = 21384
Step 67: 21384 + 324 = 21708
Step 68: 21708 + 324 = 22032
Step 69: 22032 + 324 = 22356
Step 70: 22356 + 324 = 22680
Step 71: 22680 + 324 = 23004
Step 72: 23004 + 324 = 23328
Step 73: 23328 + 324 = 23652
Step 74: 23652 + 324 = 23976
Step 75: 23976 + 324 = 24300
Step 76: 24300 + 324 = 24624
Step 77: 24624 + 324 = 24948
Step 78: 24948 + 324 = 25272
Step 79: 25272 + 324 = 25596
Step 80: 25596 + 324 = 25920
Step 81: 25920 + 324 = 26244
Step 82: 26244 + 324 = 26568
Step 83: 26568 + 324 = 26892
Step 84: 26892 + 324 = 27216
Step 85: 27216 + 324 = 27540
Step 86: 27540 + 324 = 27864
Step 87: 27864 + 324 = 28188
Step 88: 28188 + 324 = 28512
Step 89: 28512 + 324 = 28836
Step 90: 28836 + 324 = 29160
Step 91: 29160 + 324 = 29484
Step 92: 29484 + 324 = 29808
Step 93: 29808 + 324 = 30132
Step 94: 30132 + 324 = 30456
Step 95: 30456 + 324 = 30780
Step 96: 30780 + 324 = 31104
Step 97: 31104 + 324 = 31428
Step 98: 31428 + 324 = 31752
Step 99: 31752 + 324 = 32076
Step 100: 32076 + 324 = 32400
Step 101: 32400 + 324 = 32724
Step 102: 32724 + 324 = 33048
Step 103: 33048 + 324 = 33372
Step 104: 33372 + 324 = 33696
Step 105: 33696 + 324 = 34020
Step 106: 34020 + 324 = 34344
Step 107: 34344 + 324 = 34668
Step 108: 34668 + 324 = 34992
Step 109: 34992 + 324 = 35316
Step 110: 35316 + 324 = 35640
Step 111: 35640 + 324 = 35964
Step 112: 35964 + 324 = 36288
Step 113: 36288 + 324 = 36612
Step 114: 36612 + 324 = 36936
Step 115: 36936 + 324 = 37260

So, 324*115 = 37260