Let's roll up our sleeves and solve this. We have 680 and we're going to multiply it by 347, essentially adding 680 to itself 347 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

So, 680*347 = 235960