Without delay, let's solve this. We've got 48 and we will be multiplying it by 91, that is, adding 48 to itself 91 times.
Step 1: 0 + 48 = 48
Step 2: 48 + 48 = 96
Step 3: 96 + 48 = 144
Step 4: 144 + 48 = 192
Step 5: 192 + 48 = 240
Step 6: 240 + 48 = 288
Step 7: 288 + 48 = 336
Step 8: 336 + 48 = 384
Step 9: 384 + 48 = 432
Step 10: 432 + 48 = 480
Step 11: 480 + 48 = 528
Step 12: 528 + 48 = 576
Step 13: 576 + 48 = 624
Step 14: 624 + 48 = 672
Step 15: 672 + 48 = 720
Step 16: 720 + 48 = 768
Step 17: 768 + 48 = 816
Step 18: 816 + 48 = 864
Step 19: 864 + 48 = 912
Step 20: 912 + 48 = 960
Step 21: 960 + 48 = 1008
Step 22: 1008 + 48 = 1056
Step 23: 1056 + 48 = 1104
Step 24: 1104 + 48 = 1152
Step 25: 1152 + 48 = 1200
Step 26: 1200 + 48 = 1248
Step 27: 1248 + 48 = 1296
Step 28: 1296 + 48 = 1344
Step 29: 1344 + 48 = 1392
Step 30: 1392 + 48 = 1440
Step 31: 1440 + 48 = 1488
Step 32: 1488 + 48 = 1536
Step 33: 1536 + 48 = 1584
Step 34: 1584 + 48 = 1632
Step 35: 1632 + 48 = 1680
Step 36: 1680 + 48 = 1728
Step 37: 1728 + 48 = 1776
Step 38: 1776 + 48 = 1824
Step 39: 1824 + 48 = 1872
Step 40: 1872 + 48 = 1920
Step 41: 1920 + 48 = 1968
Step 42: 1968 + 48 = 2016
Step 43: 2016 + 48 = 2064
Step 44: 2064 + 48 = 2112
Step 45: 2112 + 48 = 2160
Step 46: 2160 + 48 = 2208
Step 47: 2208 + 48 = 2256
Step 48: 2256 + 48 = 2304
Step 49: 2304 + 48 = 2352
Step 50: 2352 + 48 = 2400
Step 51: 2400 + 48 = 2448
Step 52: 2448 + 48 = 2496
Step 53: 2496 + 48 = 2544
Step 54: 2544 + 48 = 2592
Step 55: 2592 + 48 = 2640
Step 56: 2640 + 48 = 2688
Step 57: 2688 + 48 = 2736
Step 58: 2736 + 48 = 2784
Step 59: 2784 + 48 = 2832
Step 60: 2832 + 48 = 2880
Step 61: 2880 + 48 = 2928
Step 62: 2928 + 48 = 2976
Step 63: 2976 + 48 = 3024
Step 64: 3024 + 48 = 3072
Step 65: 3072 + 48 = 3120
Step 66: 3120 + 48 = 3168
Step 67: 3168 + 48 = 3216
Step 68: 3216 + 48 = 3264
Step 69: 3264 + 48 = 3312
Step 70: 3312 + 48 = 3360
Step 71: 3360 + 48 = 3408
Step 72: 3408 + 48 = 3456
Step 73: 3456 + 48 = 3504
Step 74: 3504 + 48 = 3552
Step 75: 3552 + 48 = 3600
Step 76: 3600 + 48 = 3648
Step 77: 3648 + 48 = 3696
Step 78: 3696 + 48 = 3744
Step 79: 3744 + 48 = 3792
Step 80: 3792 + 48 = 3840
Step 81: 3840 + 48 = 3888
Step 82: 3888 + 48 = 3936
Step 83: 3936 + 48 = 3984
Step 84: 3984 + 48 = 4032
Step 85: 4032 + 48 = 4080
Step 86: 4080 + 48 = 4128
Step 87: 4128 + 48 = 4176
Step 88: 4176 + 48 = 4224
Step 89: 4224 + 48 = 4272
Step 90: 4272 + 48 = 4320
Step 91: 4320 + 48 = 4368

So, 48*91 = 4368