Let's roll up our sleeves and solve this. We have 36 and we're going to multiply it by 72, essentially adding 36 to itself 72 times.
Step 1: 0 + 36 = 36
Step 2: 36 + 36 = 72
Step 3: 72 + 36 = 108
Step 4: 108 + 36 = 144
Step 5: 144 + 36 = 180
Step 6: 180 + 36 = 216
Step 7: 216 + 36 = 252
Step 8: 252 + 36 = 288
Step 9: 288 + 36 = 324
Step 10: 324 + 36 = 360
Step 11: 360 + 36 = 396
Step 12: 396 + 36 = 432
Step 13: 432 + 36 = 468
Step 14: 468 + 36 = 504
Step 15: 504 + 36 = 540
Step 16: 540 + 36 = 576
Step 17: 576 + 36 = 612
Step 18: 612 + 36 = 648
Step 19: 648 + 36 = 684
Step 20: 684 + 36 = 720
Step 21: 720 + 36 = 756
Step 22: 756 + 36 = 792
Step 23: 792 + 36 = 828
Step 24: 828 + 36 = 864
Step 25: 864 + 36 = 900
Step 26: 900 + 36 = 936
Step 27: 936 + 36 = 972
Step 28: 972 + 36 = 1008
Step 29: 1008 + 36 = 1044
Step 30: 1044 + 36 = 1080
Step 31: 1080 + 36 = 1116
Step 32: 1116 + 36 = 1152
Step 33: 1152 + 36 = 1188
Step 34: 1188 + 36 = 1224
Step 35: 1224 + 36 = 1260
Step 36: 1260 + 36 = 1296
Step 37: 1296 + 36 = 1332
Step 38: 1332 + 36 = 1368
Step 39: 1368 + 36 = 1404
Step 40: 1404 + 36 = 1440
Step 41: 1440 + 36 = 1476
Step 42: 1476 + 36 = 1512
Step 43: 1512 + 36 = 1548
Step 44: 1548 + 36 = 1584
Step 45: 1584 + 36 = 1620
Step 46: 1620 + 36 = 1656
Step 47: 1656 + 36 = 1692
Step 48: 1692 + 36 = 1728
Step 49: 1728 + 36 = 1764
Step 50: 1764 + 36 = 1800
Step 51: 1800 + 36 = 1836
Step 52: 1836 + 36 = 1872
Step 53: 1872 + 36 = 1908
Step 54: 1908 + 36 = 1944
Step 55: 1944 + 36 = 1980
Step 56: 1980 + 36 = 2016
Step 57: 2016 + 36 = 2052
Step 58: 2052 + 36 = 2088
Step 59: 2088 + 36 = 2124
Step 60: 2124 + 36 = 2160
Step 61: 2160 + 36 = 2196
Step 62: 2196 + 36 = 2232
Step 63: 2232 + 36 = 2268
Step 64: 2268 + 36 = 2304
Step 65: 2304 + 36 = 2340
Step 66: 2340 + 36 = 2376
Step 67: 2376 + 36 = 2412
Step 68: 2412 + 36 = 2448
Step 69: 2448 + 36 = 2484
Step 70: 2484 + 36 = 2520
Step 71: 2520 + 36 = 2556
Step 72: 2556 + 36 = 2592

So, 36*72 = 2592