Alright, let's solve this math problem step by step. First, we have the number 840. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 411. So, we're going to take the number 840 and add it to itself 411 times.
Step 1: 0 + 840 = 840
Step 2: 840 + 840 = 1680
Step 3: 1680 + 840 = 2520
Step 4: 2520 + 840 = 3360
Step 5: 3360 + 840 = 4200
Step 6: 4200 + 840 = 5040
Step 7: 5040 + 840 = 5880
Step 8: 5880 + 840 = 6720
Step 9: 6720 + 840 = 7560
Step 10: 7560 + 840 = 8400
Step 11: 8400 + 840 = 9240
Step 12: 9240 + 840 = 10080
Step 13: 10080 + 840 = 10920
Step 14: 10920 + 840 = 11760
Step 15: 11760 + 840 = 12600
Step 16: 12600 + 840 = 13440
Step 17: 13440 + 840 = 14280
Step 18: 14280 + 840 = 15120
Step 19: 15120 + 840 = 15960
Step 20: 15960 + 840 = 16800
Step 21: 16800 + 840 = 17640
Step 22: 17640 + 840 = 18480
Step 23: 18480 + 840 = 19320
Step 24: 19320 + 840 = 20160
Step 25: 20160 + 840 = 21000
Step 26: 21000 + 840 = 21840
Step 27: 21840 + 840 = 22680
Step 28: 22680 + 840 = 23520
Step 29: 23520 + 840 = 24360
Step 30: 24360 + 840 = 25200
Step 31: 25200 + 840 = 26040
Step 32: 26040 + 840 = 26880
Step 33: 26880 + 840 = 27720
Step 34: 27720 + 840 = 28560
Step 35: 28560 + 840 = 29400
Step 36: 29400 + 840 = 30240
Step 37: 30240 + 840 = 31080
Step 38: 31080 + 840 = 31920
Step 39: 31920 + 840 = 32760
Step 40: 32760 + 840 = 33600
Step 41: 33600 + 840 = 34440
Step 42: 34440 + 840 = 35280
Step 43: 35280 + 840 = 36120
Step 44: 36120 + 840 = 36960
Step 45: 36960 + 840 = 37800
Step 46: 37800 + 840 = 38640
Step 47: 38640 + 840 = 39480
Step 48: 39480 + 840 = 40320
Step 49: 40320 + 840 = 41160
Step 50: 41160 + 840 = 42000
Step 51: 42000 + 840 = 42840
Step 52: 42840 + 840 = 43680
Step 53: 43680 + 840 = 44520
Step 54: 44520 + 840 = 45360
Step 55: 45360 + 840 = 46200
Step 56: 46200 + 840 = 47040
Step 57: 47040 + 840 = 47880
Step 58: 47880 + 840 = 48720
Step 59: 48720 + 840 = 49560
Step 60: 49560 + 840 = 50400
Step 61: 50400 + 840 = 51240
Step 62: 51240 + 840 = 52080
Step 63: 52080 + 840 = 52920
Step 64: 52920 + 840 = 53760
Step 65: 53760 + 840 = 54600
Step 66: 54600 + 840 = 55440
Step 67: 55440 + 840 = 56280
Step 68: 56280 + 840 = 57120
Step 69: 57120 + 840 = 57960
Step 70: 57960 + 840 = 58800
Step 71: 58800 + 840 = 59640
Step 72: 59640 + 840 = 60480
Step 73: 60480 + 840 = 61320
Step 74: 61320 + 840 = 62160
Step 75: 62160 + 840 = 63000
Step 76: 63000 + 840 = 63840
Step 77: 63840 + 840 = 64680
Step 78: 64680 + 840 = 65520
Step 79: 65520 + 840 = 66360
Step 80: 66360 + 840 = 67200
Step 81: 67200 + 840 = 68040
Step 82: 68040 + 840 = 68880
Step 83: 68880 + 840 = 69720
Step 84: 69720 + 840 = 70560
Step 85: 70560 + 840 = 71400
Step 86: 71400 + 840 = 72240
Step 87: 72240 + 840 = 73080
Step 88: 73080 + 840 = 73920
Step 89: 73920 + 840 = 74760
Step 90: 74760 + 840 = 75600
Step 91: 75600 + 840 = 76440
Step 92: 76440 + 840 = 77280
Step 93: 77280 + 840 = 78120
Step 94: 78120 + 840 = 78960
Step 95: 78960 + 840 = 79800
Step 96: 79800 + 840 = 80640
Step 97: 80640 + 840 = 81480
Step 98: 81480 + 840 = 82320
Step 99: 82320 + 840 = 83160
Step 100: 83160 + 840 = 84000
Step 101: 84000 + 840 = 84840
Step 102: 84840 + 840 = 85680
Step 103: 85680 + 840 = 86520
Step 104: 86520 + 840 = 87360
Step 105: 87360 + 840 = 88200
Step 106: 88200 + 840 = 89040
Step 107: 89040 + 840 = 89880
Step 108: 89880 + 840 = 90720
Step 109: 90720 + 840 = 91560
Step 110: 91560 + 840 = 92400
Step 111: 92400 + 840 = 93240
Step 112: 93240 + 840 = 94080
Step 113: 94080 + 840 = 94920
Step 114: 94920 + 840 = 95760
Step 115: 95760 + 840 = 96600
Step 116: 96600 + 840 = 97440
Step 117: 97440 + 840 = 98280
Step 118: 98280 + 840 = 99120
Step 119: 99120 + 840 = 99960
Step 120: 99960 + 840 = 100800
Step 121: 100800 + 840 = 101640
Step 122: 101640 + 840 = 102480
Step 123: 102480 + 840 = 103320
Step 124: 103320 + 840 = 104160
Step 125: 104160 + 840 = 105000
Step 126: 105000 + 840 = 105840
Step 127: 105840 + 840 = 106680
Step 128: 106680 + 840 = 107520
Step 129: 107520 + 840 = 108360
Step 130: 108360 + 840 = 109200
Step 131: 109200 + 840 = 110040
Step 132: 110040 + 840 = 110880
Step 133: 110880 + 840 = 111720
Step 134: 111720 + 840 = 112560
Step 135: 112560 + 840 = 113400
Step 136: 113400 + 840 = 114240
Step 137: 114240 + 840 = 115080
Step 138: 115080 + 840 = 115920
Step 139: 115920 + 840 = 116760
Step 140: 116760 + 840 = 117600
Step 141: 117600 + 840 = 118440
Step 142: 118440 + 840 = 119280
Step 143: 119280 + 840 = 120120
Step 144: 120120 + 840 = 120960
Step 145: 120960 + 840 = 121800
Step 146: 121800 + 840 = 122640
Step 147: 122640 + 840 = 123480
Step 148: 123480 + 840 = 124320
Step 149: 124320 + 840 = 125160
Step 150: 125160 + 840 = 126000
Step 151: 126000 + 840 = 126840
Step 152: 126840 + 840 = 127680
Step 153: 127680 + 840 = 128520
Step 154: 128520 + 840 = 129360
Step 155: 129360 + 840 = 130200
Step 156: 130200 + 840 = 131040
Step 157: 131040 + 840 = 131880
Step 158: 131880 + 840 = 132720
Step 159: 132720 + 840 = 133560
Step 160: 133560 + 840 = 134400
Step 161: 134400 + 840 = 135240
Step 162: 135240 + 840 = 136080
Step 163: 136080 + 840 = 136920
Step 164: 136920 + 840 = 137760
Step 165: 137760 + 840 = 138600
Step 166: 138600 + 840 = 139440
Step 167: 139440 + 840 = 140280
Step 168: 140280 + 840 = 141120
Step 169: 141120 + 840 = 141960
Step 170: 141960 + 840 = 142800
Step 171: 142800 + 840 = 143640
Step 172: 143640 + 840 = 144480
Step 173: 144480 + 840 = 145320
Step 174: 145320 + 840 = 146160
Step 175: 146160 + 840 = 147000
Step 176: 147000 + 840 = 147840
Step 177: 147840 + 840 = 148680
Step 178: 148680 + 840 = 149520
Step 179: 149520 + 840 = 150360
Step 180: 150360 + 840 = 151200
Step 181: 151200 + 840 = 152040
Step 182: 152040 + 840 = 152880
Step 183: 152880 + 840 = 153720
Step 184: 153720 + 840 = 154560
Step 185: 154560 + 840 = 155400
Step 186: 155400 + 840 = 156240
Step 187: 156240 + 840 = 157080
Step 188: 157080 + 840 = 157920
Step 189: 157920 + 840 = 158760
Step 190: 158760 + 840 = 159600
Step 191: 159600 + 840 = 160440
Step 192: 160440 + 840 = 161280
Step 193: 161280 + 840 = 162120
Step 194: 162120 + 840 = 162960
Step 195: 162960 + 840 = 163800
Step 196: 163800 + 840 = 164640
Step 197: 164640 + 840 = 165480
Step 198: 165480 + 840 = 166320
Step 199: 166320 + 840 = 167160
Step 200: 167160 + 840 = 168000
Step 201: 168000 + 840 = 168840
Step 202: 168840 + 840 = 169680
Step 203: 169680 + 840 = 170520
Step 204: 170520 + 840 = 171360
Step 205: 171360 + 840 = 172200
Step 206: 172200 + 840 = 173040
Step 207: 173040 + 840 = 173880
Step 208: 173880 + 840 = 174720
Step 209: 174720 + 840 = 175560
Step 210: 175560 + 840 = 176400
Step 211: 176400 + 840 = 177240
Step 212: 177240 + 840 = 178080
Step 213: 178080 + 840 = 178920
Step 214: 178920 + 840 = 179760
Step 215: 179760 + 840 = 180600
Step 216: 180600 + 840 = 181440
Step 217: 181440 + 840 = 182280
Step 218: 182280 + 840 = 183120
Step 219: 183120 + 840 = 183960
Step 220: 183960 + 840 = 184800
Step 221: 184800 + 840 = 185640
Step 222: 185640 + 840 = 186480
Step 223: 186480 + 840 = 187320
Step 224: 187320 + 840 = 188160
Step 225: 188160 + 840 = 189000
Step 226: 189000 + 840 = 189840
Step 227: 189840 + 840 = 190680
Step 228: 190680 + 840 = 191520
Step 229: 191520 + 840 = 192360
Step 230: 192360 + 840 = 193200
Step 231: 193200 + 840 = 194040
Step 232: 194040 + 840 = 194880
Step 233: 194880 + 840 = 195720
Step 234: 195720 + 840 = 196560
Step 235: 196560 + 840 = 197400
Step 236: 197400 + 840 = 198240
Step 237: 198240 + 840 = 199080
Step 238: 199080 + 840 = 199920
Step 239: 199920 + 840 = 200760
Step 240: 200760 + 840 = 201600
Step 241: 201600 + 840 = 202440
Step 242: 202440 + 840 = 203280
Step 243: 203280 + 840 = 204120
Step 244: 204120 + 840 = 204960
Step 245: 204960 + 840 = 205800
Step 246: 205800 + 840 = 206640
Step 247: 206640 + 840 = 207480
Step 248: 207480 + 840 = 208320
Step 249: 208320 + 840 = 209160
Step 250: 209160 + 840 = 210000
Step 251: 210000 + 840 = 210840
Step 252: 210840 + 840 = 211680
Step 253: 211680 + 840 = 212520
Step 254: 212520 + 840 = 213360
Step 255: 213360 + 840 = 214200
Step 256: 214200 + 840 = 215040
Step 257: 215040 + 840 = 215880
Step 258: 215880 + 840 = 216720
Step 259: 216720 + 840 = 217560
Step 260: 217560 + 840 = 218400
Step 261: 218400 + 840 = 219240
Step 262: 219240 + 840 = 220080
Step 263: 220080 + 840 = 220920
Step 264: 220920 + 840 = 221760
Step 265: 221760 + 840 = 222600
Step 266: 222600 + 840 = 223440
Step 267: 223440 + 840 = 224280
Step 268: 224280 + 840 = 225120
Step 269: 225120 + 840 = 225960
Step 270: 225960 + 840 = 226800
Step 271: 226800 + 840 = 227640
Step 272: 227640 + 840 = 228480
Step 273: 228480 + 840 = 229320
Step 274: 229320 + 840 = 230160
Step 275: 230160 + 840 = 231000
Step 276: 231000 + 840 = 231840
Step 277: 231840 + 840 = 232680
Step 278: 232680 + 840 = 233520
Step 279: 233520 + 840 = 234360
Step 280: 234360 + 840 = 235200
Step 281: 235200 + 840 = 236040
Step 282: 236040 + 840 = 236880
Step 283: 236880 + 840 = 237720
Step 284: 237720 + 840 = 238560
Step 285: 238560 + 840 = 239400
Step 286: 239400 + 840 = 240240
Step 287: 240240 + 840 = 241080
Step 288: 241080 + 840 = 241920
Step 289: 241920 + 840 = 242760
Step 290: 242760 + 840 = 243600
Step 291: 243600 + 840 = 244440
Step 292: 244440 + 840 = 245280
Step 293: 245280 + 840 = 246120
Step 294: 246120 + 840 = 246960
Step 295: 246960 + 840 = 247800
Step 296: 247800 + 840 = 248640
Step 297: 248640 + 840 = 249480
Step 298: 249480 + 840 = 250320
Step 299: 250320 + 840 = 251160
Step 300: 251160 + 840 = 252000
Step 301: 252000 + 840 = 252840
Step 302: 252840 + 840 = 253680
Step 303: 253680 + 840 = 254520
Step 304: 254520 + 840 = 255360
Step 305: 255360 + 840 = 256200
Step 306: 256200 + 840 = 257040
Step 307: 257040 + 840 = 257880
Step 308: 257880 + 840 = 258720
Step 309: 258720 + 840 = 259560
Step 310: 259560 + 840 = 260400
Step 311: 260400 + 840 = 261240
Step 312: 261240 + 840 = 262080
Step 313: 262080 + 840 = 262920
Step 314: 262920 + 840 = 263760
Step 315: 263760 + 840 = 264600
Step 316: 264600 + 840 = 265440
Step 317: 265440 + 840 = 266280
Step 318: 266280 + 840 = 267120
Step 319: 267120 + 840 = 267960
Step 320: 267960 + 840 = 268800
Step 321: 268800 + 840 = 269640
Step 322: 269640 + 840 = 270480
Step 323: 270480 + 840 = 271320
Step 324: 271320 + 840 = 272160
Step 325: 272160 + 840 = 273000
Step 326: 273000 + 840 = 273840
Step 327: 273840 + 840 = 274680
Step 328: 274680 + 840 = 275520
Step 329: 275520 + 840 = 276360
Step 330: 276360 + 840 = 277200
Step 331: 277200 + 840 = 278040
Step 332: 278040 + 840 = 278880
Step 333: 278880 + 840 = 279720
Step 334: 279720 + 840 = 280560
Step 335: 280560 + 840 = 281400
Step 336: 281400 + 840 = 282240
Step 337: 282240 + 840 = 283080
Step 338: 283080 + 840 = 283920
Step 339: 283920 + 840 = 284760
Step 340: 284760 + 840 = 285600
Step 341: 285600 + 840 = 286440
Step 342: 286440 + 840 = 287280
Step 343: 287280 + 840 = 288120
Step 344: 288120 + 840 = 288960
Step 345: 288960 + 840 = 289800
Step 346: 289800 + 840 = 290640
Step 347: 290640 + 840 = 291480
Step 348: 291480 + 840 = 292320
Step 349: 292320 + 840 = 293160
Step 350: 293160 + 840 = 294000
Step 351: 294000 + 840 = 294840
Step 352: 294840 + 840 = 295680
Step 353: 295680 + 840 = 296520
Step 354: 296520 + 840 = 297360
Step 355: 297360 + 840 = 298200
Step 356: 298200 + 840 = 299040
Step 357: 299040 + 840 = 299880
Step 358: 299880 + 840 = 300720
Step 359: 300720 + 840 = 301560
Step 360: 301560 + 840 = 302400
Step 361: 302400 + 840 = 303240
Step 362: 303240 + 840 = 304080
Step 363: 304080 + 840 = 304920
Step 364: 304920 + 840 = 305760
Step 365: 305760 + 840 = 306600
Step 366: 306600 + 840 = 307440
Step 367: 307440 + 840 = 308280
Step 368: 308280 + 840 = 309120
Step 369: 309120 + 840 = 309960
Step 370: 309960 + 840 = 310800
Step 371: 310800 + 840 = 311640
Step 372: 311640 + 840 = 312480
Step 373: 312480 + 840 = 313320
Step 374: 313320 + 840 = 314160
Step 375: 314160 + 840 = 315000
Step 376: 315000 + 840 = 315840
Step 377: 315840 + 840 = 316680
Step 378: 316680 + 840 = 317520
Step 379: 317520 + 840 = 318360
Step 380: 318360 + 840 = 319200
Step 381: 319200 + 840 = 320040
Step 382: 320040 + 840 = 320880
Step 383: 320880 + 840 = 321720
Step 384: 321720 + 840 = 322560
Step 385: 322560 + 840 = 323400
Step 386: 323400 + 840 = 324240
Step 387: 324240 + 840 = 325080
Step 388: 325080 + 840 = 325920
Step 389: 325920 + 840 = 326760
Step 390: 326760 + 840 = 327600
Step 391: 327600 + 840 = 328440
Step 392: 328440 + 840 = 329280
Step 393: 329280 + 840 = 330120
Step 394: 330120 + 840 = 330960
Step 395: 330960 + 840 = 331800
Step 396: 331800 + 840 = 332640
Step 397: 332640 + 840 = 333480
Step 398: 333480 + 840 = 334320
Step 399: 334320 + 840 = 335160
Step 400: 335160 + 840 = 336000
Step 401: 336000 + 840 = 336840
Step 402: 336840 + 840 = 337680
Step 403: 337680 + 840 = 338520
Step 404: 338520 + 840 = 339360
Step 405: 339360 + 840 = 340200
Step 406: 340200 + 840 = 341040
Step 407: 341040 + 840 = 341880
Step 408: 341880 + 840 = 342720
Step 409: 342720 + 840 = 343560
Step 410: 343560 + 840 = 344400
Step 411: 344400 + 840 = 345240

So, 840*411 = 345240