OK, let's crack this. We're given 112 and our task is to multiply it by 72. Essentially, we'll be adding 112 to itself 72 times.
Step 1: 0 + 112 = 112
Step 2: 112 + 112 = 224
Step 3: 224 + 112 = 336
Step 4: 336 + 112 = 448
Step 5: 448 + 112 = 560
Step 6: 560 + 112 = 672
Step 7: 672 + 112 = 784
Step 8: 784 + 112 = 896
Step 9: 896 + 112 = 1008
Step 10: 1008 + 112 = 1120
Step 11: 1120 + 112 = 1232
Step 12: 1232 + 112 = 1344
Step 13: 1344 + 112 = 1456
Step 14: 1456 + 112 = 1568
Step 15: 1568 + 112 = 1680
Step 16: 1680 + 112 = 1792
Step 17: 1792 + 112 = 1904
Step 18: 1904 + 112 = 2016
Step 19: 2016 + 112 = 2128
Step 20: 2128 + 112 = 2240
Step 21: 2240 + 112 = 2352
Step 22: 2352 + 112 = 2464
Step 23: 2464 + 112 = 2576
Step 24: 2576 + 112 = 2688
Step 25: 2688 + 112 = 2800
Step 26: 2800 + 112 = 2912
Step 27: 2912 + 112 = 3024
Step 28: 3024 + 112 = 3136
Step 29: 3136 + 112 = 3248
Step 30: 3248 + 112 = 3360
Step 31: 3360 + 112 = 3472
Step 32: 3472 + 112 = 3584
Step 33: 3584 + 112 = 3696
Step 34: 3696 + 112 = 3808
Step 35: 3808 + 112 = 3920
Step 36: 3920 + 112 = 4032
Step 37: 4032 + 112 = 4144
Step 38: 4144 + 112 = 4256
Step 39: 4256 + 112 = 4368
Step 40: 4368 + 112 = 4480
Step 41: 4480 + 112 = 4592
Step 42: 4592 + 112 = 4704
Step 43: 4704 + 112 = 4816
Step 44: 4816 + 112 = 4928
Step 45: 4928 + 112 = 5040
Step 46: 5040 + 112 = 5152
Step 47: 5152 + 112 = 5264
Step 48: 5264 + 112 = 5376
Step 49: 5376 + 112 = 5488
Step 50: 5488 + 112 = 5600
Step 51: 5600 + 112 = 5712
Step 52: 5712 + 112 = 5824
Step 53: 5824 + 112 = 5936
Step 54: 5936 + 112 = 6048
Step 55: 6048 + 112 = 6160
Step 56: 6160 + 112 = 6272
Step 57: 6272 + 112 = 6384
Step 58: 6384 + 112 = 6496
Step 59: 6496 + 112 = 6608
Step 60: 6608 + 112 = 6720
Step 61: 6720 + 112 = 6832
Step 62: 6832 + 112 = 6944
Step 63: 6944 + 112 = 7056
Step 64: 7056 + 112 = 7168
Step 65: 7168 + 112 = 7280
Step 66: 7280 + 112 = 7392
Step 67: 7392 + 112 = 7504
Step 68: 7504 + 112 = 7616
Step 69: 7616 + 112 = 7728
Step 70: 7728 + 112 = 7840
Step 71: 7840 + 112 = 7952
Step 72: 7952 + 112 = 8064

So, 112*72 = 8064