OK, let's crack this. We're given 340 and our task is to multiply it by 249. Essentially, we'll be adding 340 to itself 249 times.
Step 1: 0 + 340 = 340
Step 2: 340 + 340 = 680
Step 3: 680 + 340 = 1020
Step 4: 1020 + 340 = 1360
Step 5: 1360 + 340 = 1700
Step 6: 1700 + 340 = 2040
Step 7: 2040 + 340 = 2380
Step 8: 2380 + 340 = 2720
Step 9: 2720 + 340 = 3060
Step 10: 3060 + 340 = 3400
Step 11: 3400 + 340 = 3740
Step 12: 3740 + 340 = 4080
Step 13: 4080 + 340 = 4420
Step 14: 4420 + 340 = 4760
Step 15: 4760 + 340 = 5100
Step 16: 5100 + 340 = 5440
Step 17: 5440 + 340 = 5780
Step 18: 5780 + 340 = 6120
Step 19: 6120 + 340 = 6460
Step 20: 6460 + 340 = 6800
Step 21: 6800 + 340 = 7140
Step 22: 7140 + 340 = 7480
Step 23: 7480 + 340 = 7820
Step 24: 7820 + 340 = 8160
Step 25: 8160 + 340 = 8500
Step 26: 8500 + 340 = 8840
Step 27: 8840 + 340 = 9180
Step 28: 9180 + 340 = 9520
Step 29: 9520 + 340 = 9860
Step 30: 9860 + 340 = 10200
Step 31: 10200 + 340 = 10540
Step 32: 10540 + 340 = 10880
Step 33: 10880 + 340 = 11220
Step 34: 11220 + 340 = 11560
Step 35: 11560 + 340 = 11900
Step 36: 11900 + 340 = 12240
Step 37: 12240 + 340 = 12580
Step 38: 12580 + 340 = 12920
Step 39: 12920 + 340 = 13260
Step 40: 13260 + 340 = 13600
Step 41: 13600 + 340 = 13940
Step 42: 13940 + 340 = 14280
Step 43: 14280 + 340 = 14620
Step 44: 14620 + 340 = 14960
Step 45: 14960 + 340 = 15300
Step 46: 15300 + 340 = 15640
Step 47: 15640 + 340 = 15980
Step 48: 15980 + 340 = 16320
Step 49: 16320 + 340 = 16660
Step 50: 16660 + 340 = 17000
Step 51: 17000 + 340 = 17340
Step 52: 17340 + 340 = 17680
Step 53: 17680 + 340 = 18020
Step 54: 18020 + 340 = 18360
Step 55: 18360 + 340 = 18700
Step 56: 18700 + 340 = 19040
Step 57: 19040 + 340 = 19380
Step 58: 19380 + 340 = 19720
Step 59: 19720 + 340 = 20060
Step 60: 20060 + 340 = 20400
Step 61: 20400 + 340 = 20740
Step 62: 20740 + 340 = 21080
Step 63: 21080 + 340 = 21420
Step 64: 21420 + 340 = 21760
Step 65: 21760 + 340 = 22100
Step 66: 22100 + 340 = 22440
Step 67: 22440 + 340 = 22780
Step 68: 22780 + 340 = 23120
Step 69: 23120 + 340 = 23460
Step 70: 23460 + 340 = 23800
Step 71: 23800 + 340 = 24140
Step 72: 24140 + 340 = 24480
Step 73: 24480 + 340 = 24820
Step 74: 24820 + 340 = 25160
Step 75: 25160 + 340 = 25500
Step 76: 25500 + 340 = 25840
Step 77: 25840 + 340 = 26180
Step 78: 26180 + 340 = 26520
Step 79: 26520 + 340 = 26860
Step 80: 26860 + 340 = 27200
Step 81: 27200 + 340 = 27540
Step 82: 27540 + 340 = 27880
Step 83: 27880 + 340 = 28220
Step 84: 28220 + 340 = 28560
Step 85: 28560 + 340 = 28900
Step 86: 28900 + 340 = 29240
Step 87: 29240 + 340 = 29580
Step 88: 29580 + 340 = 29920
Step 89: 29920 + 340 = 30260
Step 90: 30260 + 340 = 30600
Step 91: 30600 + 340 = 30940
Step 92: 30940 + 340 = 31280
Step 93: 31280 + 340 = 31620
Step 94: 31620 + 340 = 31960
Step 95: 31960 + 340 = 32300
Step 96: 32300 + 340 = 32640
Step 97: 32640 + 340 = 32980
Step 98: 32980 + 340 = 33320
Step 99: 33320 + 340 = 33660
Step 100: 33660 + 340 = 34000
Step 101: 34000 + 340 = 34340
Step 102: 34340 + 340 = 34680
Step 103: 34680 + 340 = 35020
Step 104: 35020 + 340 = 35360
Step 105: 35360 + 340 = 35700
Step 106: 35700 + 340 = 36040
Step 107: 36040 + 340 = 36380
Step 108: 36380 + 340 = 36720
Step 109: 36720 + 340 = 37060
Step 110: 37060 + 340 = 37400
Step 111: 37400 + 340 = 37740
Step 112: 37740 + 340 = 38080
Step 113: 38080 + 340 = 38420
Step 114: 38420 + 340 = 38760
Step 115: 38760 + 340 = 39100
Step 116: 39100 + 340 = 39440
Step 117: 39440 + 340 = 39780
Step 118: 39780 + 340 = 40120
Step 119: 40120 + 340 = 40460
Step 120: 40460 + 340 = 40800
Step 121: 40800 + 340 = 41140
Step 122: 41140 + 340 = 41480
Step 123: 41480 + 340 = 41820
Step 124: 41820 + 340 = 42160
Step 125: 42160 + 340 = 42500
Step 126: 42500 + 340 = 42840
Step 127: 42840 + 340 = 43180
Step 128: 43180 + 340 = 43520
Step 129: 43520 + 340 = 43860
Step 130: 43860 + 340 = 44200
Step 131: 44200 + 340 = 44540
Step 132: 44540 + 340 = 44880
Step 133: 44880 + 340 = 45220
Step 134: 45220 + 340 = 45560
Step 135: 45560 + 340 = 45900
Step 136: 45900 + 340 = 46240
Step 137: 46240 + 340 = 46580
Step 138: 46580 + 340 = 46920
Step 139: 46920 + 340 = 47260
Step 140: 47260 + 340 = 47600
Step 141: 47600 + 340 = 47940
Step 142: 47940 + 340 = 48280
Step 143: 48280 + 340 = 48620
Step 144: 48620 + 340 = 48960
Step 145: 48960 + 340 = 49300
Step 146: 49300 + 340 = 49640
Step 147: 49640 + 340 = 49980
Step 148: 49980 + 340 = 50320
Step 149: 50320 + 340 = 50660
Step 150: 50660 + 340 = 51000
Step 151: 51000 + 340 = 51340
Step 152: 51340 + 340 = 51680
Step 153: 51680 + 340 = 52020
Step 154: 52020 + 340 = 52360
Step 155: 52360 + 340 = 52700
Step 156: 52700 + 340 = 53040
Step 157: 53040 + 340 = 53380
Step 158: 53380 + 340 = 53720
Step 159: 53720 + 340 = 54060
Step 160: 54060 + 340 = 54400
Step 161: 54400 + 340 = 54740
Step 162: 54740 + 340 = 55080
Step 163: 55080 + 340 = 55420
Step 164: 55420 + 340 = 55760
Step 165: 55760 + 340 = 56100
Step 166: 56100 + 340 = 56440
Step 167: 56440 + 340 = 56780
Step 168: 56780 + 340 = 57120
Step 169: 57120 + 340 = 57460
Step 170: 57460 + 340 = 57800
Step 171: 57800 + 340 = 58140
Step 172: 58140 + 340 = 58480
Step 173: 58480 + 340 = 58820
Step 174: 58820 + 340 = 59160
Step 175: 59160 + 340 = 59500
Step 176: 59500 + 340 = 59840
Step 177: 59840 + 340 = 60180
Step 178: 60180 + 340 = 60520
Step 179: 60520 + 340 = 60860
Step 180: 60860 + 340 = 61200
Step 181: 61200 + 340 = 61540
Step 182: 61540 + 340 = 61880
Step 183: 61880 + 340 = 62220
Step 184: 62220 + 340 = 62560
Step 185: 62560 + 340 = 62900
Step 186: 62900 + 340 = 63240
Step 187: 63240 + 340 = 63580
Step 188: 63580 + 340 = 63920
Step 189: 63920 + 340 = 64260
Step 190: 64260 + 340 = 64600
Step 191: 64600 + 340 = 64940
Step 192: 64940 + 340 = 65280
Step 193: 65280 + 340 = 65620
Step 194: 65620 + 340 = 65960
Step 195: 65960 + 340 = 66300
Step 196: 66300 + 340 = 66640
Step 197: 66640 + 340 = 66980
Step 198: 66980 + 340 = 67320
Step 199: 67320 + 340 = 67660
Step 200: 67660 + 340 = 68000
Step 201: 68000 + 340 = 68340
Step 202: 68340 + 340 = 68680
Step 203: 68680 + 340 = 69020
Step 204: 69020 + 340 = 69360
Step 205: 69360 + 340 = 69700
Step 206: 69700 + 340 = 70040
Step 207: 70040 + 340 = 70380
Step 208: 70380 + 340 = 70720
Step 209: 70720 + 340 = 71060
Step 210: 71060 + 340 = 71400
Step 211: 71400 + 340 = 71740
Step 212: 71740 + 340 = 72080
Step 213: 72080 + 340 = 72420
Step 214: 72420 + 340 = 72760
Step 215: 72760 + 340 = 73100
Step 216: 73100 + 340 = 73440
Step 217: 73440 + 340 = 73780
Step 218: 73780 + 340 = 74120
Step 219: 74120 + 340 = 74460
Step 220: 74460 + 340 = 74800
Step 221: 74800 + 340 = 75140
Step 222: 75140 + 340 = 75480
Step 223: 75480 + 340 = 75820
Step 224: 75820 + 340 = 76160
Step 225: 76160 + 340 = 76500
Step 226: 76500 + 340 = 76840
Step 227: 76840 + 340 = 77180
Step 228: 77180 + 340 = 77520
Step 229: 77520 + 340 = 77860
Step 230: 77860 + 340 = 78200
Step 231: 78200 + 340 = 78540
Step 232: 78540 + 340 = 78880
Step 233: 78880 + 340 = 79220
Step 234: 79220 + 340 = 79560
Step 235: 79560 + 340 = 79900
Step 236: 79900 + 340 = 80240
Step 237: 80240 + 340 = 80580
Step 238: 80580 + 340 = 80920
Step 239: 80920 + 340 = 81260
Step 240: 81260 + 340 = 81600
Step 241: 81600 + 340 = 81940
Step 242: 81940 + 340 = 82280
Step 243: 82280 + 340 = 82620
Step 244: 82620 + 340 = 82960
Step 245: 82960 + 340 = 83300
Step 246: 83300 + 340 = 83640
Step 247: 83640 + 340 = 83980
Step 248: 83980 + 340 = 84320
Step 249: 84320 + 340 = 84660

So, 340*249 = 84660