Let's get this math done. We have 400 and we're going to multiply it by 380. This is the same as taking 400 and adding it to itself 380 times.
Step 1: 0 + 400 = 400
Step 2: 400 + 400 = 800
Step 3: 800 + 400 = 1200
Step 4: 1200 + 400 = 1600
Step 5: 1600 + 400 = 2000
Step 6: 2000 + 400 = 2400
Step 7: 2400 + 400 = 2800
Step 8: 2800 + 400 = 3200
Step 9: 3200 + 400 = 3600
Step 10: 3600 + 400 = 4000
Step 11: 4000 + 400 = 4400
Step 12: 4400 + 400 = 4800
Step 13: 4800 + 400 = 5200
Step 14: 5200 + 400 = 5600
Step 15: 5600 + 400 = 6000
Step 16: 6000 + 400 = 6400
Step 17: 6400 + 400 = 6800
Step 18: 6800 + 400 = 7200
Step 19: 7200 + 400 = 7600
Step 20: 7600 + 400 = 8000
Step 21: 8000 + 400 = 8400
Step 22: 8400 + 400 = 8800
Step 23: 8800 + 400 = 9200
Step 24: 9200 + 400 = 9600
Step 25: 9600 + 400 = 10000
Step 26: 10000 + 400 = 10400
Step 27: 10400 + 400 = 10800
Step 28: 10800 + 400 = 11200
Step 29: 11200 + 400 = 11600
Step 30: 11600 + 400 = 12000
Step 31: 12000 + 400 = 12400
Step 32: 12400 + 400 = 12800
Step 33: 12800 + 400 = 13200
Step 34: 13200 + 400 = 13600
Step 35: 13600 + 400 = 14000
Step 36: 14000 + 400 = 14400
Step 37: 14400 + 400 = 14800
Step 38: 14800 + 400 = 15200
Step 39: 15200 + 400 = 15600
Step 40: 15600 + 400 = 16000
Step 41: 16000 + 400 = 16400
Step 42: 16400 + 400 = 16800
Step 43: 16800 + 400 = 17200
Step 44: 17200 + 400 = 17600
Step 45: 17600 + 400 = 18000
Step 46: 18000 + 400 = 18400
Step 47: 18400 + 400 = 18800
Step 48: 18800 + 400 = 19200
Step 49: 19200 + 400 = 19600
Step 50: 19600 + 400 = 20000
Step 51: 20000 + 400 = 20400
Step 52: 20400 + 400 = 20800
Step 53: 20800 + 400 = 21200
Step 54: 21200 + 400 = 21600
Step 55: 21600 + 400 = 22000
Step 56: 22000 + 400 = 22400
Step 57: 22400 + 400 = 22800
Step 58: 22800 + 400 = 23200
Step 59: 23200 + 400 = 23600
Step 60: 23600 + 400 = 24000
Step 61: 24000 + 400 = 24400
Step 62: 24400 + 400 = 24800
Step 63: 24800 + 400 = 25200
Step 64: 25200 + 400 = 25600
Step 65: 25600 + 400 = 26000
Step 66: 26000 + 400 = 26400
Step 67: 26400 + 400 = 26800
Step 68: 26800 + 400 = 27200
Step 69: 27200 + 400 = 27600
Step 70: 27600 + 400 = 28000
Step 71: 28000 + 400 = 28400
Step 72: 28400 + 400 = 28800
Step 73: 28800 + 400 = 29200
Step 74: 29200 + 400 = 29600
Step 75: 29600 + 400 = 30000
Step 76: 30000 + 400 = 30400
Step 77: 30400 + 400 = 30800
Step 78: 30800 + 400 = 31200
Step 79: 31200 + 400 = 31600
Step 80: 31600 + 400 = 32000
Step 81: 32000 + 400 = 32400
Step 82: 32400 + 400 = 32800
Step 83: 32800 + 400 = 33200
Step 84: 33200 + 400 = 33600
Step 85: 33600 + 400 = 34000
Step 86: 34000 + 400 = 34400
Step 87: 34400 + 400 = 34800
Step 88: 34800 + 400 = 35200
Step 89: 35200 + 400 = 35600
Step 90: 35600 + 400 = 36000
Step 91: 36000 + 400 = 36400
Step 92: 36400 + 400 = 36800
Step 93: 36800 + 400 = 37200
Step 94: 37200 + 400 = 37600
Step 95: 37600 + 400 = 38000
Step 96: 38000 + 400 = 38400
Step 97: 38400 + 400 = 38800
Step 98: 38800 + 400 = 39200
Step 99: 39200 + 400 = 39600
Step 100: 39600 + 400 = 40000
Step 101: 40000 + 400 = 40400
Step 102: 40400 + 400 = 40800
Step 103: 40800 + 400 = 41200
Step 104: 41200 + 400 = 41600
Step 105: 41600 + 400 = 42000
Step 106: 42000 + 400 = 42400
Step 107: 42400 + 400 = 42800
Step 108: 42800 + 400 = 43200
Step 109: 43200 + 400 = 43600
Step 110: 43600 + 400 = 44000
Step 111: 44000 + 400 = 44400
Step 112: 44400 + 400 = 44800
Step 113: 44800 + 400 = 45200
Step 114: 45200 + 400 = 45600
Step 115: 45600 + 400 = 46000
Step 116: 46000 + 400 = 46400
Step 117: 46400 + 400 = 46800
Step 118: 46800 + 400 = 47200
Step 119: 47200 + 400 = 47600
Step 120: 47600 + 400 = 48000
Step 121: 48000 + 400 = 48400
Step 122: 48400 + 400 = 48800
Step 123: 48800 + 400 = 49200
Step 124: 49200 + 400 = 49600
Step 125: 49600 + 400 = 50000
Step 126: 50000 + 400 = 50400
Step 127: 50400 + 400 = 50800
Step 128: 50800 + 400 = 51200
Step 129: 51200 + 400 = 51600
Step 130: 51600 + 400 = 52000
Step 131: 52000 + 400 = 52400
Step 132: 52400 + 400 = 52800
Step 133: 52800 + 400 = 53200
Step 134: 53200 + 400 = 53600
Step 135: 53600 + 400 = 54000
Step 136: 54000 + 400 = 54400
Step 137: 54400 + 400 = 54800
Step 138: 54800 + 400 = 55200
Step 139: 55200 + 400 = 55600
Step 140: 55600 + 400 = 56000
Step 141: 56000 + 400 = 56400
Step 142: 56400 + 400 = 56800
Step 143: 56800 + 400 = 57200
Step 144: 57200 + 400 = 57600
Step 145: 57600 + 400 = 58000
Step 146: 58000 + 400 = 58400
Step 147: 58400 + 400 = 58800
Step 148: 58800 + 400 = 59200
Step 149: 59200 + 400 = 59600
Step 150: 59600 + 400 = 60000
Step 151: 60000 + 400 = 60400
Step 152: 60400 + 400 = 60800
Step 153: 60800 + 400 = 61200
Step 154: 61200 + 400 = 61600
Step 155: 61600 + 400 = 62000
Step 156: 62000 + 400 = 62400
Step 157: 62400 + 400 = 62800
Step 158: 62800 + 400 = 63200
Step 159: 63200 + 400 = 63600
Step 160: 63600 + 400 = 64000
Step 161: 64000 + 400 = 64400
Step 162: 64400 + 400 = 64800
Step 163: 64800 + 400 = 65200
Step 164: 65200 + 400 = 65600
Step 165: 65600 + 400 = 66000
Step 166: 66000 + 400 = 66400
Step 167: 66400 + 400 = 66800
Step 168: 66800 + 400 = 67200
Step 169: 67200 + 400 = 67600
Step 170: 67600 + 400 = 68000
Step 171: 68000 + 400 = 68400
Step 172: 68400 + 400 = 68800
Step 173: 68800 + 400 = 69200
Step 174: 69200 + 400 = 69600
Step 175: 69600 + 400 = 70000
Step 176: 70000 + 400 = 70400
Step 177: 70400 + 400 = 70800
Step 178: 70800 + 400 = 71200
Step 179: 71200 + 400 = 71600
Step 180: 71600 + 400 = 72000
Step 181: 72000 + 400 = 72400
Step 182: 72400 + 400 = 72800
Step 183: 72800 + 400 = 73200
Step 184: 73200 + 400 = 73600
Step 185: 73600 + 400 = 74000
Step 186: 74000 + 400 = 74400
Step 187: 74400 + 400 = 74800
Step 188: 74800 + 400 = 75200
Step 189: 75200 + 400 = 75600
Step 190: 75600 + 400 = 76000
Step 191: 76000 + 400 = 76400
Step 192: 76400 + 400 = 76800
Step 193: 76800 + 400 = 77200
Step 194: 77200 + 400 = 77600
Step 195: 77600 + 400 = 78000
Step 196: 78000 + 400 = 78400
Step 197: 78400 + 400 = 78800
Step 198: 78800 + 400 = 79200
Step 199: 79200 + 400 = 79600
Step 200: 79600 + 400 = 80000
Step 201: 80000 + 400 = 80400
Step 202: 80400 + 400 = 80800
Step 203: 80800 + 400 = 81200
Step 204: 81200 + 400 = 81600
Step 205: 81600 + 400 = 82000
Step 206: 82000 + 400 = 82400
Step 207: 82400 + 400 = 82800
Step 208: 82800 + 400 = 83200
Step 209: 83200 + 400 = 83600
Step 210: 83600 + 400 = 84000
Step 211: 84000 + 400 = 84400
Step 212: 84400 + 400 = 84800
Step 213: 84800 + 400 = 85200
Step 214: 85200 + 400 = 85600
Step 215: 85600 + 400 = 86000
Step 216: 86000 + 400 = 86400
Step 217: 86400 + 400 = 86800
Step 218: 86800 + 400 = 87200
Step 219: 87200 + 400 = 87600
Step 220: 87600 + 400 = 88000
Step 221: 88000 + 400 = 88400
Step 222: 88400 + 400 = 88800
Step 223: 88800 + 400 = 89200
Step 224: 89200 + 400 = 89600
Step 225: 89600 + 400 = 90000
Step 226: 90000 + 400 = 90400
Step 227: 90400 + 400 = 90800
Step 228: 90800 + 400 = 91200
Step 229: 91200 + 400 = 91600
Step 230: 91600 + 400 = 92000
Step 231: 92000 + 400 = 92400
Step 232: 92400 + 400 = 92800
Step 233: 92800 + 400 = 93200
Step 234: 93200 + 400 = 93600
Step 235: 93600 + 400 = 94000
Step 236: 94000 + 400 = 94400
Step 237: 94400 + 400 = 94800
Step 238: 94800 + 400 = 95200
Step 239: 95200 + 400 = 95600
Step 240: 95600 + 400 = 96000
Step 241: 96000 + 400 = 96400
Step 242: 96400 + 400 = 96800
Step 243: 96800 + 400 = 97200
Step 244: 97200 + 400 = 97600
Step 245: 97600 + 400 = 98000
Step 246: 98000 + 400 = 98400
Step 247: 98400 + 400 = 98800
Step 248: 98800 + 400 = 99200
Step 249: 99200 + 400 = 99600
Step 250: 99600 + 400 = 100000
Step 251: 100000 + 400 = 100400
Step 252: 100400 + 400 = 100800
Step 253: 100800 + 400 = 101200
Step 254: 101200 + 400 = 101600
Step 255: 101600 + 400 = 102000
Step 256: 102000 + 400 = 102400
Step 257: 102400 + 400 = 102800
Step 258: 102800 + 400 = 103200
Step 259: 103200 + 400 = 103600
Step 260: 103600 + 400 = 104000
Step 261: 104000 + 400 = 104400
Step 262: 104400 + 400 = 104800
Step 263: 104800 + 400 = 105200
Step 264: 105200 + 400 = 105600
Step 265: 105600 + 400 = 106000
Step 266: 106000 + 400 = 106400
Step 267: 106400 + 400 = 106800
Step 268: 106800 + 400 = 107200
Step 269: 107200 + 400 = 107600
Step 270: 107600 + 400 = 108000
Step 271: 108000 + 400 = 108400
Step 272: 108400 + 400 = 108800
Step 273: 108800 + 400 = 109200
Step 274: 109200 + 400 = 109600
Step 275: 109600 + 400 = 110000
Step 276: 110000 + 400 = 110400
Step 277: 110400 + 400 = 110800
Step 278: 110800 + 400 = 111200
Step 279: 111200 + 400 = 111600
Step 280: 111600 + 400 = 112000
Step 281: 112000 + 400 = 112400
Step 282: 112400 + 400 = 112800
Step 283: 112800 + 400 = 113200
Step 284: 113200 + 400 = 113600
Step 285: 113600 + 400 = 114000
Step 286: 114000 + 400 = 114400
Step 287: 114400 + 400 = 114800
Step 288: 114800 + 400 = 115200
Step 289: 115200 + 400 = 115600
Step 290: 115600 + 400 = 116000
Step 291: 116000 + 400 = 116400
Step 292: 116400 + 400 = 116800
Step 293: 116800 + 400 = 117200
Step 294: 117200 + 400 = 117600
Step 295: 117600 + 400 = 118000
Step 296: 118000 + 400 = 118400
Step 297: 118400 + 400 = 118800
Step 298: 118800 + 400 = 119200
Step 299: 119200 + 400 = 119600
Step 300: 119600 + 400 = 120000
Step 301: 120000 + 400 = 120400
Step 302: 120400 + 400 = 120800
Step 303: 120800 + 400 = 121200
Step 304: 121200 + 400 = 121600
Step 305: 121600 + 400 = 122000
Step 306: 122000 + 400 = 122400
Step 307: 122400 + 400 = 122800
Step 308: 122800 + 400 = 123200
Step 309: 123200 + 400 = 123600
Step 310: 123600 + 400 = 124000
Step 311: 124000 + 400 = 124400
Step 312: 124400 + 400 = 124800
Step 313: 124800 + 400 = 125200
Step 314: 125200 + 400 = 125600
Step 315: 125600 + 400 = 126000
Step 316: 126000 + 400 = 126400
Step 317: 126400 + 400 = 126800
Step 318: 126800 + 400 = 127200
Step 319: 127200 + 400 = 127600
Step 320: 127600 + 400 = 128000
Step 321: 128000 + 400 = 128400
Step 322: 128400 + 400 = 128800
Step 323: 128800 + 400 = 129200
Step 324: 129200 + 400 = 129600
Step 325: 129600 + 400 = 130000
Step 326: 130000 + 400 = 130400
Step 327: 130400 + 400 = 130800
Step 328: 130800 + 400 = 131200
Step 329: 131200 + 400 = 131600
Step 330: 131600 + 400 = 132000
Step 331: 132000 + 400 = 132400
Step 332: 132400 + 400 = 132800
Step 333: 132800 + 400 = 133200
Step 334: 133200 + 400 = 133600
Step 335: 133600 + 400 = 134000
Step 336: 134000 + 400 = 134400
Step 337: 134400 + 400 = 134800
Step 338: 134800 + 400 = 135200
Step 339: 135200 + 400 = 135600
Step 340: 135600 + 400 = 136000
Step 341: 136000 + 400 = 136400
Step 342: 136400 + 400 = 136800
Step 343: 136800 + 400 = 137200
Step 344: 137200 + 400 = 137600
Step 345: 137600 + 400 = 138000
Step 346: 138000 + 400 = 138400
Step 347: 138400 + 400 = 138800
Step 348: 138800 + 400 = 139200
Step 349: 139200 + 400 = 139600
Step 350: 139600 + 400 = 140000
Step 351: 140000 + 400 = 140400
Step 352: 140400 + 400 = 140800
Step 353: 140800 + 400 = 141200
Step 354: 141200 + 400 = 141600
Step 355: 141600 + 400 = 142000
Step 356: 142000 + 400 = 142400
Step 357: 142400 + 400 = 142800
Step 358: 142800 + 400 = 143200
Step 359: 143200 + 400 = 143600
Step 360: 143600 + 400 = 144000
Step 361: 144000 + 400 = 144400
Step 362: 144400 + 400 = 144800
Step 363: 144800 + 400 = 145200
Step 364: 145200 + 400 = 145600
Step 365: 145600 + 400 = 146000
Step 366: 146000 + 400 = 146400
Step 367: 146400 + 400 = 146800
Step 368: 146800 + 400 = 147200
Step 369: 147200 + 400 = 147600
Step 370: 147600 + 400 = 148000
Step 371: 148000 + 400 = 148400
Step 372: 148400 + 400 = 148800
Step 373: 148800 + 400 = 149200
Step 374: 149200 + 400 = 149600
Step 375: 149600 + 400 = 150000
Step 376: 150000 + 400 = 150400
Step 377: 150400 + 400 = 150800
Step 378: 150800 + 400 = 151200
Step 379: 151200 + 400 = 151600
Step 380: 151600 + 400 = 152000

So, 400*380 = 152000