Let's roll up our sleeves and solve this. We have 80 and we're going to multiply it by 350, essentially adding 80 to itself 350 times.
Step 1: 0 + 80 = 80
Step 2: 80 + 80 = 160
Step 3: 160 + 80 = 240
Step 4: 240 + 80 = 320
Step 5: 320 + 80 = 400
Step 6: 400 + 80 = 480
Step 7: 480 + 80 = 560
Step 8: 560 + 80 = 640
Step 9: 640 + 80 = 720
Step 10: 720 + 80 = 800
Step 11: 800 + 80 = 880
Step 12: 880 + 80 = 960
Step 13: 960 + 80 = 1040
Step 14: 1040 + 80 = 1120
Step 15: 1120 + 80 = 1200
Step 16: 1200 + 80 = 1280
Step 17: 1280 + 80 = 1360
Step 18: 1360 + 80 = 1440
Step 19: 1440 + 80 = 1520
Step 20: 1520 + 80 = 1600
Step 21: 1600 + 80 = 1680
Step 22: 1680 + 80 = 1760
Step 23: 1760 + 80 = 1840
Step 24: 1840 + 80 = 1920
Step 25: 1920 + 80 = 2000
Step 26: 2000 + 80 = 2080
Step 27: 2080 + 80 = 2160
Step 28: 2160 + 80 = 2240
Step 29: 2240 + 80 = 2320
Step 30: 2320 + 80 = 2400
Step 31: 2400 + 80 = 2480
Step 32: 2480 + 80 = 2560
Step 33: 2560 + 80 = 2640
Step 34: 2640 + 80 = 2720
Step 35: 2720 + 80 = 2800
Step 36: 2800 + 80 = 2880
Step 37: 2880 + 80 = 2960
Step 38: 2960 + 80 = 3040
Step 39: 3040 + 80 = 3120
Step 40: 3120 + 80 = 3200
Step 41: 3200 + 80 = 3280
Step 42: 3280 + 80 = 3360
Step 43: 3360 + 80 = 3440
Step 44: 3440 + 80 = 3520
Step 45: 3520 + 80 = 3600
Step 46: 3600 + 80 = 3680
Step 47: 3680 + 80 = 3760
Step 48: 3760 + 80 = 3840
Step 49: 3840 + 80 = 3920
Step 50: 3920 + 80 = 4000
Step 51: 4000 + 80 = 4080
Step 52: 4080 + 80 = 4160
Step 53: 4160 + 80 = 4240
Step 54: 4240 + 80 = 4320
Step 55: 4320 + 80 = 4400
Step 56: 4400 + 80 = 4480
Step 57: 4480 + 80 = 4560
Step 58: 4560 + 80 = 4640
Step 59: 4640 + 80 = 4720
Step 60: 4720 + 80 = 4800
Step 61: 4800 + 80 = 4880
Step 62: 4880 + 80 = 4960
Step 63: 4960 + 80 = 5040
Step 64: 5040 + 80 = 5120
Step 65: 5120 + 80 = 5200
Step 66: 5200 + 80 = 5280
Step 67: 5280 + 80 = 5360
Step 68: 5360 + 80 = 5440
Step 69: 5440 + 80 = 5520
Step 70: 5520 + 80 = 5600
Step 71: 5600 + 80 = 5680
Step 72: 5680 + 80 = 5760
Step 73: 5760 + 80 = 5840
Step 74: 5840 + 80 = 5920
Step 75: 5920 + 80 = 6000
Step 76: 6000 + 80 = 6080
Step 77: 6080 + 80 = 6160
Step 78: 6160 + 80 = 6240
Step 79: 6240 + 80 = 6320
Step 80: 6320 + 80 = 6400
Step 81: 6400 + 80 = 6480
Step 82: 6480 + 80 = 6560
Step 83: 6560 + 80 = 6640
Step 84: 6640 + 80 = 6720
Step 85: 6720 + 80 = 6800
Step 86: 6800 + 80 = 6880
Step 87: 6880 + 80 = 6960
Step 88: 6960 + 80 = 7040
Step 89: 7040 + 80 = 7120
Step 90: 7120 + 80 = 7200
Step 91: 7200 + 80 = 7280
Step 92: 7280 + 80 = 7360
Step 93: 7360 + 80 = 7440
Step 94: 7440 + 80 = 7520
Step 95: 7520 + 80 = 7600
Step 96: 7600 + 80 = 7680
Step 97: 7680 + 80 = 7760
Step 98: 7760 + 80 = 7840
Step 99: 7840 + 80 = 7920
Step 100: 7920 + 80 = 8000
Step 101: 8000 + 80 = 8080
Step 102: 8080 + 80 = 8160
Step 103: 8160 + 80 = 8240
Step 104: 8240 + 80 = 8320
Step 105: 8320 + 80 = 8400
Step 106: 8400 + 80 = 8480
Step 107: 8480 + 80 = 8560
Step 108: 8560 + 80 = 8640
Step 109: 8640 + 80 = 8720
Step 110: 8720 + 80 = 8800
Step 111: 8800 + 80 = 8880
Step 112: 8880 + 80 = 8960
Step 113: 8960 + 80 = 9040
Step 114: 9040 + 80 = 9120
Step 115: 9120 + 80 = 9200
Step 116: 9200 + 80 = 9280
Step 117: 9280 + 80 = 9360
Step 118: 9360 + 80 = 9440
Step 119: 9440 + 80 = 9520
Step 120: 9520 + 80 = 9600
Step 121: 9600 + 80 = 9680
Step 122: 9680 + 80 = 9760
Step 123: 9760 + 80 = 9840
Step 124: 9840 + 80 = 9920
Step 125: 9920 + 80 = 10000
Step 126: 10000 + 80 = 10080
Step 127: 10080 + 80 = 10160
Step 128: 10160 + 80 = 10240
Step 129: 10240 + 80 = 10320
Step 130: 10320 + 80 = 10400
Step 131: 10400 + 80 = 10480
Step 132: 10480 + 80 = 10560
Step 133: 10560 + 80 = 10640
Step 134: 10640 + 80 = 10720
Step 135: 10720 + 80 = 10800
Step 136: 10800 + 80 = 10880
Step 137: 10880 + 80 = 10960
Step 138: 10960 + 80 = 11040
Step 139: 11040 + 80 = 11120
Step 140: 11120 + 80 = 11200
Step 141: 11200 + 80 = 11280
Step 142: 11280 + 80 = 11360
Step 143: 11360 + 80 = 11440
Step 144: 11440 + 80 = 11520
Step 145: 11520 + 80 = 11600
Step 146: 11600 + 80 = 11680
Step 147: 11680 + 80 = 11760
Step 148: 11760 + 80 = 11840
Step 149: 11840 + 80 = 11920
Step 150: 11920 + 80 = 12000
Step 151: 12000 + 80 = 12080
Step 152: 12080 + 80 = 12160
Step 153: 12160 + 80 = 12240
Step 154: 12240 + 80 = 12320
Step 155: 12320 + 80 = 12400
Step 156: 12400 + 80 = 12480
Step 157: 12480 + 80 = 12560
Step 158: 12560 + 80 = 12640
Step 159: 12640 + 80 = 12720
Step 160: 12720 + 80 = 12800
Step 161: 12800 + 80 = 12880
Step 162: 12880 + 80 = 12960
Step 163: 12960 + 80 = 13040
Step 164: 13040 + 80 = 13120
Step 165: 13120 + 80 = 13200
Step 166: 13200 + 80 = 13280
Step 167: 13280 + 80 = 13360
Step 168: 13360 + 80 = 13440
Step 169: 13440 + 80 = 13520
Step 170: 13520 + 80 = 13600
Step 171: 13600 + 80 = 13680
Step 172: 13680 + 80 = 13760
Step 173: 13760 + 80 = 13840
Step 174: 13840 + 80 = 13920
Step 175: 13920 + 80 = 14000
Step 176: 14000 + 80 = 14080
Step 177: 14080 + 80 = 14160
Step 178: 14160 + 80 = 14240
Step 179: 14240 + 80 = 14320
Step 180: 14320 + 80 = 14400
Step 181: 14400 + 80 = 14480
Step 182: 14480 + 80 = 14560
Step 183: 14560 + 80 = 14640
Step 184: 14640 + 80 = 14720
Step 185: 14720 + 80 = 14800
Step 186: 14800 + 80 = 14880
Step 187: 14880 + 80 = 14960
Step 188: 14960 + 80 = 15040
Step 189: 15040 + 80 = 15120
Step 190: 15120 + 80 = 15200
Step 191: 15200 + 80 = 15280
Step 192: 15280 + 80 = 15360
Step 193: 15360 + 80 = 15440
Step 194: 15440 + 80 = 15520
Step 195: 15520 + 80 = 15600
Step 196: 15600 + 80 = 15680
Step 197: 15680 + 80 = 15760
Step 198: 15760 + 80 = 15840
Step 199: 15840 + 80 = 15920
Step 200: 15920 + 80 = 16000
Step 201: 16000 + 80 = 16080
Step 202: 16080 + 80 = 16160
Step 203: 16160 + 80 = 16240
Step 204: 16240 + 80 = 16320
Step 205: 16320 + 80 = 16400
Step 206: 16400 + 80 = 16480
Step 207: 16480 + 80 = 16560
Step 208: 16560 + 80 = 16640
Step 209: 16640 + 80 = 16720
Step 210: 16720 + 80 = 16800
Step 211: 16800 + 80 = 16880
Step 212: 16880 + 80 = 16960
Step 213: 16960 + 80 = 17040
Step 214: 17040 + 80 = 17120
Step 215: 17120 + 80 = 17200
Step 216: 17200 + 80 = 17280
Step 217: 17280 + 80 = 17360
Step 218: 17360 + 80 = 17440
Step 219: 17440 + 80 = 17520
Step 220: 17520 + 80 = 17600
Step 221: 17600 + 80 = 17680
Step 222: 17680 + 80 = 17760
Step 223: 17760 + 80 = 17840
Step 224: 17840 + 80 = 17920
Step 225: 17920 + 80 = 18000
Step 226: 18000 + 80 = 18080
Step 227: 18080 + 80 = 18160
Step 228: 18160 + 80 = 18240
Step 229: 18240 + 80 = 18320
Step 230: 18320 + 80 = 18400
Step 231: 18400 + 80 = 18480
Step 232: 18480 + 80 = 18560
Step 233: 18560 + 80 = 18640
Step 234: 18640 + 80 = 18720
Step 235: 18720 + 80 = 18800
Step 236: 18800 + 80 = 18880
Step 237: 18880 + 80 = 18960
Step 238: 18960 + 80 = 19040
Step 239: 19040 + 80 = 19120
Step 240: 19120 + 80 = 19200
Step 241: 19200 + 80 = 19280
Step 242: 19280 + 80 = 19360
Step 243: 19360 + 80 = 19440
Step 244: 19440 + 80 = 19520
Step 245: 19520 + 80 = 19600
Step 246: 19600 + 80 = 19680
Step 247: 19680 + 80 = 19760
Step 248: 19760 + 80 = 19840
Step 249: 19840 + 80 = 19920
Step 250: 19920 + 80 = 20000
Step 251: 20000 + 80 = 20080
Step 252: 20080 + 80 = 20160
Step 253: 20160 + 80 = 20240
Step 254: 20240 + 80 = 20320
Step 255: 20320 + 80 = 20400
Step 256: 20400 + 80 = 20480
Step 257: 20480 + 80 = 20560
Step 258: 20560 + 80 = 20640
Step 259: 20640 + 80 = 20720
Step 260: 20720 + 80 = 20800
Step 261: 20800 + 80 = 20880
Step 262: 20880 + 80 = 20960
Step 263: 20960 + 80 = 21040
Step 264: 21040 + 80 = 21120
Step 265: 21120 + 80 = 21200
Step 266: 21200 + 80 = 21280
Step 267: 21280 + 80 = 21360
Step 268: 21360 + 80 = 21440
Step 269: 21440 + 80 = 21520
Step 270: 21520 + 80 = 21600
Step 271: 21600 + 80 = 21680
Step 272: 21680 + 80 = 21760
Step 273: 21760 + 80 = 21840
Step 274: 21840 + 80 = 21920
Step 275: 21920 + 80 = 22000
Step 276: 22000 + 80 = 22080
Step 277: 22080 + 80 = 22160
Step 278: 22160 + 80 = 22240
Step 279: 22240 + 80 = 22320
Step 280: 22320 + 80 = 22400
Step 281: 22400 + 80 = 22480
Step 282: 22480 + 80 = 22560
Step 283: 22560 + 80 = 22640
Step 284: 22640 + 80 = 22720
Step 285: 22720 + 80 = 22800
Step 286: 22800 + 80 = 22880
Step 287: 22880 + 80 = 22960
Step 288: 22960 + 80 = 23040
Step 289: 23040 + 80 = 23120
Step 290: 23120 + 80 = 23200
Step 291: 23200 + 80 = 23280
Step 292: 23280 + 80 = 23360
Step 293: 23360 + 80 = 23440
Step 294: 23440 + 80 = 23520
Step 295: 23520 + 80 = 23600
Step 296: 23600 + 80 = 23680
Step 297: 23680 + 80 = 23760
Step 298: 23760 + 80 = 23840
Step 299: 23840 + 80 = 23920
Step 300: 23920 + 80 = 24000
Step 301: 24000 + 80 = 24080
Step 302: 24080 + 80 = 24160
Step 303: 24160 + 80 = 24240
Step 304: 24240 + 80 = 24320
Step 305: 24320 + 80 = 24400
Step 306: 24400 + 80 = 24480
Step 307: 24480 + 80 = 24560
Step 308: 24560 + 80 = 24640
Step 309: 24640 + 80 = 24720
Step 310: 24720 + 80 = 24800
Step 311: 24800 + 80 = 24880
Step 312: 24880 + 80 = 24960
Step 313: 24960 + 80 = 25040
Step 314: 25040 + 80 = 25120
Step 315: 25120 + 80 = 25200
Step 316: 25200 + 80 = 25280
Step 317: 25280 + 80 = 25360
Step 318: 25360 + 80 = 25440
Step 319: 25440 + 80 = 25520
Step 320: 25520 + 80 = 25600
Step 321: 25600 + 80 = 25680
Step 322: 25680 + 80 = 25760
Step 323: 25760 + 80 = 25840
Step 324: 25840 + 80 = 25920
Step 325: 25920 + 80 = 26000
Step 326: 26000 + 80 = 26080
Step 327: 26080 + 80 = 26160
Step 328: 26160 + 80 = 26240
Step 329: 26240 + 80 = 26320
Step 330: 26320 + 80 = 26400
Step 331: 26400 + 80 = 26480
Step 332: 26480 + 80 = 26560
Step 333: 26560 + 80 = 26640
Step 334: 26640 + 80 = 26720
Step 335: 26720 + 80 = 26800
Step 336: 26800 + 80 = 26880
Step 337: 26880 + 80 = 26960
Step 338: 26960 + 80 = 27040
Step 339: 27040 + 80 = 27120
Step 340: 27120 + 80 = 27200
Step 341: 27200 + 80 = 27280
Step 342: 27280 + 80 = 27360
Step 343: 27360 + 80 = 27440
Step 344: 27440 + 80 = 27520
Step 345: 27520 + 80 = 27600
Step 346: 27600 + 80 = 27680
Step 347: 27680 + 80 = 27760
Step 348: 27760 + 80 = 27840
Step 349: 27840 + 80 = 27920
Step 350: 27920 + 80 = 28000

So, 80*350 = 28000