Let's roll up our sleeves and solve this. We have 245 and we're going to multiply it by 99, essentially adding 245 to itself 99 times.
Step 1: 0 + 245 = 245
Step 2: 245 + 245 = 490
Step 3: 490 + 245 = 735
Step 4: 735 + 245 = 980
Step 5: 980 + 245 = 1225
Step 6: 1225 + 245 = 1470
Step 7: 1470 + 245 = 1715
Step 8: 1715 + 245 = 1960
Step 9: 1960 + 245 = 2205
Step 10: 2205 + 245 = 2450
Step 11: 2450 + 245 = 2695
Step 12: 2695 + 245 = 2940
Step 13: 2940 + 245 = 3185
Step 14: 3185 + 245 = 3430
Step 15: 3430 + 245 = 3675
Step 16: 3675 + 245 = 3920
Step 17: 3920 + 245 = 4165
Step 18: 4165 + 245 = 4410
Step 19: 4410 + 245 = 4655
Step 20: 4655 + 245 = 4900
Step 21: 4900 + 245 = 5145
Step 22: 5145 + 245 = 5390
Step 23: 5390 + 245 = 5635
Step 24: 5635 + 245 = 5880
Step 25: 5880 + 245 = 6125
Step 26: 6125 + 245 = 6370
Step 27: 6370 + 245 = 6615
Step 28: 6615 + 245 = 6860
Step 29: 6860 + 245 = 7105
Step 30: 7105 + 245 = 7350
Step 31: 7350 + 245 = 7595
Step 32: 7595 + 245 = 7840
Step 33: 7840 + 245 = 8085
Step 34: 8085 + 245 = 8330
Step 35: 8330 + 245 = 8575
Step 36: 8575 + 245 = 8820
Step 37: 8820 + 245 = 9065
Step 38: 9065 + 245 = 9310
Step 39: 9310 + 245 = 9555
Step 40: 9555 + 245 = 9800
Step 41: 9800 + 245 = 10045
Step 42: 10045 + 245 = 10290
Step 43: 10290 + 245 = 10535
Step 44: 10535 + 245 = 10780
Step 45: 10780 + 245 = 11025
Step 46: 11025 + 245 = 11270
Step 47: 11270 + 245 = 11515
Step 48: 11515 + 245 = 11760
Step 49: 11760 + 245 = 12005
Step 50: 12005 + 245 = 12250
Step 51: 12250 + 245 = 12495
Step 52: 12495 + 245 = 12740
Step 53: 12740 + 245 = 12985
Step 54: 12985 + 245 = 13230
Step 55: 13230 + 245 = 13475
Step 56: 13475 + 245 = 13720
Step 57: 13720 + 245 = 13965
Step 58: 13965 + 245 = 14210
Step 59: 14210 + 245 = 14455
Step 60: 14455 + 245 = 14700
Step 61: 14700 + 245 = 14945
Step 62: 14945 + 245 = 15190
Step 63: 15190 + 245 = 15435
Step 64: 15435 + 245 = 15680
Step 65: 15680 + 245 = 15925
Step 66: 15925 + 245 = 16170
Step 67: 16170 + 245 = 16415
Step 68: 16415 + 245 = 16660
Step 69: 16660 + 245 = 16905
Step 70: 16905 + 245 = 17150
Step 71: 17150 + 245 = 17395
Step 72: 17395 + 245 = 17640
Step 73: 17640 + 245 = 17885
Step 74: 17885 + 245 = 18130
Step 75: 18130 + 245 = 18375
Step 76: 18375 + 245 = 18620
Step 77: 18620 + 245 = 18865
Step 78: 18865 + 245 = 19110
Step 79: 19110 + 245 = 19355
Step 80: 19355 + 245 = 19600
Step 81: 19600 + 245 = 19845
Step 82: 19845 + 245 = 20090
Step 83: 20090 + 245 = 20335
Step 84: 20335 + 245 = 20580
Step 85: 20580 + 245 = 20825
Step 86: 20825 + 245 = 21070
Step 87: 21070 + 245 = 21315
Step 88: 21315 + 245 = 21560
Step 89: 21560 + 245 = 21805
Step 90: 21805 + 245 = 22050
Step 91: 22050 + 245 = 22295
Step 92: 22295 + 245 = 22540
Step 93: 22540 + 245 = 22785
Step 94: 22785 + 245 = 23030
Step 95: 23030 + 245 = 23275
Step 96: 23275 + 245 = 23520
Step 97: 23520 + 245 = 23765
Step 98: 23765 + 245 = 24010
Step 99: 24010 + 245 = 24255

So, 245*99 = 24255