Alright, let's solve this math problem step by step. First, we have the number 680. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 426. So, we're going to take the number 680 and add it to itself 426 times.
Step 1: 0 + 680 = 680
Step 2: 680 + 680 = 1360
Step 3: 1360 + 680 = 2040
Step 4: 2040 + 680 = 2720
Step 5: 2720 + 680 = 3400
Step 6: 3400 + 680 = 4080
Step 7: 4080 + 680 = 4760
Step 8: 4760 + 680 = 5440
Step 9: 5440 + 680 = 6120
Step 10: 6120 + 680 = 6800
Step 11: 6800 + 680 = 7480
Step 12: 7480 + 680 = 8160
Step 13: 8160 + 680 = 8840
Step 14: 8840 + 680 = 9520
Step 15: 9520 + 680 = 10200
Step 16: 10200 + 680 = 10880
Step 17: 10880 + 680 = 11560
Step 18: 11560 + 680 = 12240
Step 19: 12240 + 680 = 12920
Step 20: 12920 + 680 = 13600
Step 21: 13600 + 680 = 14280
Step 22: 14280 + 680 = 14960
Step 23: 14960 + 680 = 15640
Step 24: 15640 + 680 = 16320
Step 25: 16320 + 680 = 17000
Step 26: 17000 + 680 = 17680
Step 27: 17680 + 680 = 18360
Step 28: 18360 + 680 = 19040
Step 29: 19040 + 680 = 19720
Step 30: 19720 + 680 = 20400
Step 31: 20400 + 680 = 21080
Step 32: 21080 + 680 = 21760
Step 33: 21760 + 680 = 22440
Step 34: 22440 + 680 = 23120
Step 35: 23120 + 680 = 23800
Step 36: 23800 + 680 = 24480
Step 37: 24480 + 680 = 25160
Step 38: 25160 + 680 = 25840
Step 39: 25840 + 680 = 26520
Step 40: 26520 + 680 = 27200
Step 41: 27200 + 680 = 27880
Step 42: 27880 + 680 = 28560
Step 43: 28560 + 680 = 29240
Step 44: 29240 + 680 = 29920
Step 45: 29920 + 680 = 30600
Step 46: 30600 + 680 = 31280
Step 47: 31280 + 680 = 31960
Step 48: 31960 + 680 = 32640
Step 49: 32640 + 680 = 33320
Step 50: 33320 + 680 = 34000
Step 51: 34000 + 680 = 34680
Step 52: 34680 + 680 = 35360
Step 53: 35360 + 680 = 36040
Step 54: 36040 + 680 = 36720
Step 55: 36720 + 680 = 37400
Step 56: 37400 + 680 = 38080
Step 57: 38080 + 680 = 38760
Step 58: 38760 + 680 = 39440
Step 59: 39440 + 680 = 40120
Step 60: 40120 + 680 = 40800
Step 61: 40800 + 680 = 41480
Step 62: 41480 + 680 = 42160
Step 63: 42160 + 680 = 42840
Step 64: 42840 + 680 = 43520
Step 65: 43520 + 680 = 44200
Step 66: 44200 + 680 = 44880
Step 67: 44880 + 680 = 45560
Step 68: 45560 + 680 = 46240
Step 69: 46240 + 680 = 46920
Step 70: 46920 + 680 = 47600
Step 71: 47600 + 680 = 48280
Step 72: 48280 + 680 = 48960
Step 73: 48960 + 680 = 49640
Step 74: 49640 + 680 = 50320
Step 75: 50320 + 680 = 51000
Step 76: 51000 + 680 = 51680
Step 77: 51680 + 680 = 52360
Step 78: 52360 + 680 = 53040
Step 79: 53040 + 680 = 53720
Step 80: 53720 + 680 = 54400
Step 81: 54400 + 680 = 55080
Step 82: 55080 + 680 = 55760
Step 83: 55760 + 680 = 56440
Step 84: 56440 + 680 = 57120
Step 85: 57120 + 680 = 57800
Step 86: 57800 + 680 = 58480
Step 87: 58480 + 680 = 59160
Step 88: 59160 + 680 = 59840
Step 89: 59840 + 680 = 60520
Step 90: 60520 + 680 = 61200
Step 91: 61200 + 680 = 61880
Step 92: 61880 + 680 = 62560
Step 93: 62560 + 680 = 63240
Step 94: 63240 + 680 = 63920
Step 95: 63920 + 680 = 64600
Step 96: 64600 + 680 = 65280
Step 97: 65280 + 680 = 65960
Step 98: 65960 + 680 = 66640
Step 99: 66640 + 680 = 67320
Step 100: 67320 + 680 = 68000
Step 101: 68000 + 680 = 68680
Step 102: 68680 + 680 = 69360
Step 103: 69360 + 680 = 70040
Step 104: 70040 + 680 = 70720
Step 105: 70720 + 680 = 71400
Step 106: 71400 + 680 = 72080
Step 107: 72080 + 680 = 72760
Step 108: 72760 + 680 = 73440
Step 109: 73440 + 680 = 74120
Step 110: 74120 + 680 = 74800
Step 111: 74800 + 680 = 75480
Step 112: 75480 + 680 = 76160
Step 113: 76160 + 680 = 76840
Step 114: 76840 + 680 = 77520
Step 115: 77520 + 680 = 78200
Step 116: 78200 + 680 = 78880
Step 117: 78880 + 680 = 79560
Step 118: 79560 + 680 = 80240
Step 119: 80240 + 680 = 80920
Step 120: 80920 + 680 = 81600
Step 121: 81600 + 680 = 82280
Step 122: 82280 + 680 = 82960
Step 123: 82960 + 680 = 83640
Step 124: 83640 + 680 = 84320
Step 125: 84320 + 680 = 85000
Step 126: 85000 + 680 = 85680
Step 127: 85680 + 680 = 86360
Step 128: 86360 + 680 = 87040
Step 129: 87040 + 680 = 87720
Step 130: 87720 + 680 = 88400
Step 131: 88400 + 680 = 89080
Step 132: 89080 + 680 = 89760
Step 133: 89760 + 680 = 90440
Step 134: 90440 + 680 = 91120
Step 135: 91120 + 680 = 91800
Step 136: 91800 + 680 = 92480
Step 137: 92480 + 680 = 93160
Step 138: 93160 + 680 = 93840
Step 139: 93840 + 680 = 94520
Step 140: 94520 + 680 = 95200
Step 141: 95200 + 680 = 95880
Step 142: 95880 + 680 = 96560
Step 143: 96560 + 680 = 97240
Step 144: 97240 + 680 = 97920
Step 145: 97920 + 680 = 98600
Step 146: 98600 + 680 = 99280
Step 147: 99280 + 680 = 99960
Step 148: 99960 + 680 = 100640
Step 149: 100640 + 680 = 101320
Step 150: 101320 + 680 = 102000
Step 151: 102000 + 680 = 102680
Step 152: 102680 + 680 = 103360
Step 153: 103360 + 680 = 104040
Step 154: 104040 + 680 = 104720
Step 155: 104720 + 680 = 105400
Step 156: 105400 + 680 = 106080
Step 157: 106080 + 680 = 106760
Step 158: 106760 + 680 = 107440
Step 159: 107440 + 680 = 108120
Step 160: 108120 + 680 = 108800
Step 161: 108800 + 680 = 109480
Step 162: 109480 + 680 = 110160
Step 163: 110160 + 680 = 110840
Step 164: 110840 + 680 = 111520
Step 165: 111520 + 680 = 112200
Step 166: 112200 + 680 = 112880
Step 167: 112880 + 680 = 113560
Step 168: 113560 + 680 = 114240
Step 169: 114240 + 680 = 114920
Step 170: 114920 + 680 = 115600
Step 171: 115600 + 680 = 116280
Step 172: 116280 + 680 = 116960
Step 173: 116960 + 680 = 117640
Step 174: 117640 + 680 = 118320
Step 175: 118320 + 680 = 119000
Step 176: 119000 + 680 = 119680
Step 177: 119680 + 680 = 120360
Step 178: 120360 + 680 = 121040
Step 179: 121040 + 680 = 121720
Step 180: 121720 + 680 = 122400
Step 181: 122400 + 680 = 123080
Step 182: 123080 + 680 = 123760
Step 183: 123760 + 680 = 124440
Step 184: 124440 + 680 = 125120
Step 185: 125120 + 680 = 125800
Step 186: 125800 + 680 = 126480
Step 187: 126480 + 680 = 127160
Step 188: 127160 + 680 = 127840
Step 189: 127840 + 680 = 128520
Step 190: 128520 + 680 = 129200
Step 191: 129200 + 680 = 129880
Step 192: 129880 + 680 = 130560
Step 193: 130560 + 680 = 131240
Step 194: 131240 + 680 = 131920
Step 195: 131920 + 680 = 132600
Step 196: 132600 + 680 = 133280
Step 197: 133280 + 680 = 133960
Step 198: 133960 + 680 = 134640
Step 199: 134640 + 680 = 135320
Step 200: 135320 + 680 = 136000
Step 201: 136000 + 680 = 136680
Step 202: 136680 + 680 = 137360
Step 203: 137360 + 680 = 138040
Step 204: 138040 + 680 = 138720
Step 205: 138720 + 680 = 139400
Step 206: 139400 + 680 = 140080
Step 207: 140080 + 680 = 140760
Step 208: 140760 + 680 = 141440
Step 209: 141440 + 680 = 142120
Step 210: 142120 + 680 = 142800
Step 211: 142800 + 680 = 143480
Step 212: 143480 + 680 = 144160
Step 213: 144160 + 680 = 144840
Step 214: 144840 + 680 = 145520
Step 215: 145520 + 680 = 146200
Step 216: 146200 + 680 = 146880
Step 217: 146880 + 680 = 147560
Step 218: 147560 + 680 = 148240
Step 219: 148240 + 680 = 148920
Step 220: 148920 + 680 = 149600
Step 221: 149600 + 680 = 150280
Step 222: 150280 + 680 = 150960
Step 223: 150960 + 680 = 151640
Step 224: 151640 + 680 = 152320
Step 225: 152320 + 680 = 153000
Step 226: 153000 + 680 = 153680
Step 227: 153680 + 680 = 154360
Step 228: 154360 + 680 = 155040
Step 229: 155040 + 680 = 155720
Step 230: 155720 + 680 = 156400
Step 231: 156400 + 680 = 157080
Step 232: 157080 + 680 = 157760
Step 233: 157760 + 680 = 158440
Step 234: 158440 + 680 = 159120
Step 235: 159120 + 680 = 159800
Step 236: 159800 + 680 = 160480
Step 237: 160480 + 680 = 161160
Step 238: 161160 + 680 = 161840
Step 239: 161840 + 680 = 162520
Step 240: 162520 + 680 = 163200
Step 241: 163200 + 680 = 163880
Step 242: 163880 + 680 = 164560
Step 243: 164560 + 680 = 165240
Step 244: 165240 + 680 = 165920
Step 245: 165920 + 680 = 166600
Step 246: 166600 + 680 = 167280
Step 247: 167280 + 680 = 167960
Step 248: 167960 + 680 = 168640
Step 249: 168640 + 680 = 169320
Step 250: 169320 + 680 = 170000
Step 251: 170000 + 680 = 170680
Step 252: 170680 + 680 = 171360
Step 253: 171360 + 680 = 172040
Step 254: 172040 + 680 = 172720
Step 255: 172720 + 680 = 173400
Step 256: 173400 + 680 = 174080
Step 257: 174080 + 680 = 174760
Step 258: 174760 + 680 = 175440
Step 259: 175440 + 680 = 176120
Step 260: 176120 + 680 = 176800
Step 261: 176800 + 680 = 177480
Step 262: 177480 + 680 = 178160
Step 263: 178160 + 680 = 178840
Step 264: 178840 + 680 = 179520
Step 265: 179520 + 680 = 180200
Step 266: 180200 + 680 = 180880
Step 267: 180880 + 680 = 181560
Step 268: 181560 + 680 = 182240
Step 269: 182240 + 680 = 182920
Step 270: 182920 + 680 = 183600
Step 271: 183600 + 680 = 184280
Step 272: 184280 + 680 = 184960
Step 273: 184960 + 680 = 185640
Step 274: 185640 + 680 = 186320
Step 275: 186320 + 680 = 187000
Step 276: 187000 + 680 = 187680
Step 277: 187680 + 680 = 188360
Step 278: 188360 + 680 = 189040
Step 279: 189040 + 680 = 189720
Step 280: 189720 + 680 = 190400
Step 281: 190400 + 680 = 191080
Step 282: 191080 + 680 = 191760
Step 283: 191760 + 680 = 192440
Step 284: 192440 + 680 = 193120
Step 285: 193120 + 680 = 193800
Step 286: 193800 + 680 = 194480
Step 287: 194480 + 680 = 195160
Step 288: 195160 + 680 = 195840
Step 289: 195840 + 680 = 196520
Step 290: 196520 + 680 = 197200
Step 291: 197200 + 680 = 197880
Step 292: 197880 + 680 = 198560
Step 293: 198560 + 680 = 199240
Step 294: 199240 + 680 = 199920
Step 295: 199920 + 680 = 200600
Step 296: 200600 + 680 = 201280
Step 297: 201280 + 680 = 201960
Step 298: 201960 + 680 = 202640
Step 299: 202640 + 680 = 203320
Step 300: 203320 + 680 = 204000
Step 301: 204000 + 680 = 204680
Step 302: 204680 + 680 = 205360
Step 303: 205360 + 680 = 206040
Step 304: 206040 + 680 = 206720
Step 305: 206720 + 680 = 207400
Step 306: 207400 + 680 = 208080
Step 307: 208080 + 680 = 208760
Step 308: 208760 + 680 = 209440
Step 309: 209440 + 680 = 210120
Step 310: 210120 + 680 = 210800
Step 311: 210800 + 680 = 211480
Step 312: 211480 + 680 = 212160
Step 313: 212160 + 680 = 212840
Step 314: 212840 + 680 = 213520
Step 315: 213520 + 680 = 214200
Step 316: 214200 + 680 = 214880
Step 317: 214880 + 680 = 215560
Step 318: 215560 + 680 = 216240
Step 319: 216240 + 680 = 216920
Step 320: 216920 + 680 = 217600
Step 321: 217600 + 680 = 218280
Step 322: 218280 + 680 = 218960
Step 323: 218960 + 680 = 219640
Step 324: 219640 + 680 = 220320
Step 325: 220320 + 680 = 221000
Step 326: 221000 + 680 = 221680
Step 327: 221680 + 680 = 222360
Step 328: 222360 + 680 = 223040
Step 329: 223040 + 680 = 223720
Step 330: 223720 + 680 = 224400
Step 331: 224400 + 680 = 225080
Step 332: 225080 + 680 = 225760
Step 333: 225760 + 680 = 226440
Step 334: 226440 + 680 = 227120
Step 335: 227120 + 680 = 227800
Step 336: 227800 + 680 = 228480
Step 337: 228480 + 680 = 229160
Step 338: 229160 + 680 = 229840
Step 339: 229840 + 680 = 230520
Step 340: 230520 + 680 = 231200
Step 341: 231200 + 680 = 231880
Step 342: 231880 + 680 = 232560
Step 343: 232560 + 680 = 233240
Step 344: 233240 + 680 = 233920
Step 345: 233920 + 680 = 234600
Step 346: 234600 + 680 = 235280
Step 347: 235280 + 680 = 235960
Step 348: 235960 + 680 = 236640
Step 349: 236640 + 680 = 237320
Step 350: 237320 + 680 = 238000
Step 351: 238000 + 680 = 238680
Step 352: 238680 + 680 = 239360
Step 353: 239360 + 680 = 240040
Step 354: 240040 + 680 = 240720
Step 355: 240720 + 680 = 241400
Step 356: 241400 + 680 = 242080
Step 357: 242080 + 680 = 242760
Step 358: 242760 + 680 = 243440
Step 359: 243440 + 680 = 244120
Step 360: 244120 + 680 = 244800
Step 361: 244800 + 680 = 245480
Step 362: 245480 + 680 = 246160
Step 363: 246160 + 680 = 246840
Step 364: 246840 + 680 = 247520
Step 365: 247520 + 680 = 248200
Step 366: 248200 + 680 = 248880
Step 367: 248880 + 680 = 249560
Step 368: 249560 + 680 = 250240
Step 369: 250240 + 680 = 250920
Step 370: 250920 + 680 = 251600
Step 371: 251600 + 680 = 252280
Step 372: 252280 + 680 = 252960
Step 373: 252960 + 680 = 253640
Step 374: 253640 + 680 = 254320
Step 375: 254320 + 680 = 255000
Step 376: 255000 + 680 = 255680
Step 377: 255680 + 680 = 256360
Step 378: 256360 + 680 = 257040
Step 379: 257040 + 680 = 257720
Step 380: 257720 + 680 = 258400
Step 381: 258400 + 680 = 259080
Step 382: 259080 + 680 = 259760
Step 383: 259760 + 680 = 260440
Step 384: 260440 + 680 = 261120
Step 385: 261120 + 680 = 261800
Step 386: 261800 + 680 = 262480
Step 387: 262480 + 680 = 263160
Step 388: 263160 + 680 = 263840
Step 389: 263840 + 680 = 264520
Step 390: 264520 + 680 = 265200
Step 391: 265200 + 680 = 265880
Step 392: 265880 + 680 = 266560
Step 393: 266560 + 680 = 267240
Step 394: 267240 + 680 = 267920
Step 395: 267920 + 680 = 268600
Step 396: 268600 + 680 = 269280
Step 397: 269280 + 680 = 269960
Step 398: 269960 + 680 = 270640
Step 399: 270640 + 680 = 271320
Step 400: 271320 + 680 = 272000
Step 401: 272000 + 680 = 272680
Step 402: 272680 + 680 = 273360
Step 403: 273360 + 680 = 274040
Step 404: 274040 + 680 = 274720
Step 405: 274720 + 680 = 275400
Step 406: 275400 + 680 = 276080
Step 407: 276080 + 680 = 276760
Step 408: 276760 + 680 = 277440
Step 409: 277440 + 680 = 278120
Step 410: 278120 + 680 = 278800
Step 411: 278800 + 680 = 279480
Step 412: 279480 + 680 = 280160
Step 413: 280160 + 680 = 280840
Step 414: 280840 + 680 = 281520
Step 415: 281520 + 680 = 282200
Step 416: 282200 + 680 = 282880
Step 417: 282880 + 680 = 283560
Step 418: 283560 + 680 = 284240
Step 419: 284240 + 680 = 284920
Step 420: 284920 + 680 = 285600
Step 421: 285600 + 680 = 286280
Step 422: 286280 + 680 = 286960
Step 423: 286960 + 680 = 287640
Step 424: 287640 + 680 = 288320
Step 425: 288320 + 680 = 289000
Step 426: 289000 + 680 = 289680

So, 680*426 = 289680