Sure thing! We've got 224 and we're gonna multiply it by 91. That's the same as adding 224 to itself 91 times.
Step 1: 0 + 224 = 224
Step 2: 224 + 224 = 448
Step 3: 448 + 224 = 672
Step 4: 672 + 224 = 896
Step 5: 896 + 224 = 1120
Step 6: 1120 + 224 = 1344
Step 7: 1344 + 224 = 1568
Step 8: 1568 + 224 = 1792
Step 9: 1792 + 224 = 2016
Step 10: 2016 + 224 = 2240
Step 11: 2240 + 224 = 2464
Step 12: 2464 + 224 = 2688
Step 13: 2688 + 224 = 2912
Step 14: 2912 + 224 = 3136
Step 15: 3136 + 224 = 3360
Step 16: 3360 + 224 = 3584
Step 17: 3584 + 224 = 3808
Step 18: 3808 + 224 = 4032
Step 19: 4032 + 224 = 4256
Step 20: 4256 + 224 = 4480
Step 21: 4480 + 224 = 4704
Step 22: 4704 + 224 = 4928
Step 23: 4928 + 224 = 5152
Step 24: 5152 + 224 = 5376
Step 25: 5376 + 224 = 5600
Step 26: 5600 + 224 = 5824
Step 27: 5824 + 224 = 6048
Step 28: 6048 + 224 = 6272
Step 29: 6272 + 224 = 6496
Step 30: 6496 + 224 = 6720
Step 31: 6720 + 224 = 6944
Step 32: 6944 + 224 = 7168
Step 33: 7168 + 224 = 7392
Step 34: 7392 + 224 = 7616
Step 35: 7616 + 224 = 7840
Step 36: 7840 + 224 = 8064
Step 37: 8064 + 224 = 8288
Step 38: 8288 + 224 = 8512
Step 39: 8512 + 224 = 8736
Step 40: 8736 + 224 = 8960
Step 41: 8960 + 224 = 9184
Step 42: 9184 + 224 = 9408
Step 43: 9408 + 224 = 9632
Step 44: 9632 + 224 = 9856
Step 45: 9856 + 224 = 10080
Step 46: 10080 + 224 = 10304
Step 47: 10304 + 224 = 10528
Step 48: 10528 + 224 = 10752
Step 49: 10752 + 224 = 10976
Step 50: 10976 + 224 = 11200
Step 51: 11200 + 224 = 11424
Step 52: 11424 + 224 = 11648
Step 53: 11648 + 224 = 11872
Step 54: 11872 + 224 = 12096
Step 55: 12096 + 224 = 12320
Step 56: 12320 + 224 = 12544
Step 57: 12544 + 224 = 12768
Step 58: 12768 + 224 = 12992
Step 59: 12992 + 224 = 13216
Step 60: 13216 + 224 = 13440
Step 61: 13440 + 224 = 13664
Step 62: 13664 + 224 = 13888
Step 63: 13888 + 224 = 14112
Step 64: 14112 + 224 = 14336
Step 65: 14336 + 224 = 14560
Step 66: 14560 + 224 = 14784
Step 67: 14784 + 224 = 15008
Step 68: 15008 + 224 = 15232
Step 69: 15232 + 224 = 15456
Step 70: 15456 + 224 = 15680
Step 71: 15680 + 224 = 15904
Step 72: 15904 + 224 = 16128
Step 73: 16128 + 224 = 16352
Step 74: 16352 + 224 = 16576
Step 75: 16576 + 224 = 16800
Step 76: 16800 + 224 = 17024
Step 77: 17024 + 224 = 17248
Step 78: 17248 + 224 = 17472
Step 79: 17472 + 224 = 17696
Step 80: 17696 + 224 = 17920
Step 81: 17920 + 224 = 18144
Step 82: 18144 + 224 = 18368
Step 83: 18368 + 224 = 18592
Step 84: 18592 + 224 = 18816
Step 85: 18816 + 224 = 19040
Step 86: 19040 + 224 = 19264
Step 87: 19264 + 224 = 19488
Step 88: 19488 + 224 = 19712
Step 89: 19712 + 224 = 19936
Step 90: 19936 + 224 = 20160
Step 91: 20160 + 224 = 20384

So, 224*91 = 20384