OK, let's crack this. We're given 880 and our task is to multiply it by 378. Essentially, we'll be adding 880 to itself 378 times.
Step 1: 0 + 880 = 880
Step 2: 880 + 880 = 1760
Step 3: 1760 + 880 = 2640
Step 4: 2640 + 880 = 3520
Step 5: 3520 + 880 = 4400
Step 6: 4400 + 880 = 5280
Step 7: 5280 + 880 = 6160
Step 8: 6160 + 880 = 7040
Step 9: 7040 + 880 = 7920
Step 10: 7920 + 880 = 8800
Step 11: 8800 + 880 = 9680
Step 12: 9680 + 880 = 10560
Step 13: 10560 + 880 = 11440
Step 14: 11440 + 880 = 12320
Step 15: 12320 + 880 = 13200
Step 16: 13200 + 880 = 14080
Step 17: 14080 + 880 = 14960
Step 18: 14960 + 880 = 15840
Step 19: 15840 + 880 = 16720
Step 20: 16720 + 880 = 17600
Step 21: 17600 + 880 = 18480
Step 22: 18480 + 880 = 19360
Step 23: 19360 + 880 = 20240
Step 24: 20240 + 880 = 21120
Step 25: 21120 + 880 = 22000
Step 26: 22000 + 880 = 22880
Step 27: 22880 + 880 = 23760
Step 28: 23760 + 880 = 24640
Step 29: 24640 + 880 = 25520
Step 30: 25520 + 880 = 26400
Step 31: 26400 + 880 = 27280
Step 32: 27280 + 880 = 28160
Step 33: 28160 + 880 = 29040
Step 34: 29040 + 880 = 29920
Step 35: 29920 + 880 = 30800
Step 36: 30800 + 880 = 31680
Step 37: 31680 + 880 = 32560
Step 38: 32560 + 880 = 33440
Step 39: 33440 + 880 = 34320
Step 40: 34320 + 880 = 35200
Step 41: 35200 + 880 = 36080
Step 42: 36080 + 880 = 36960
Step 43: 36960 + 880 = 37840
Step 44: 37840 + 880 = 38720
Step 45: 38720 + 880 = 39600
Step 46: 39600 + 880 = 40480
Step 47: 40480 + 880 = 41360
Step 48: 41360 + 880 = 42240
Step 49: 42240 + 880 = 43120
Step 50: 43120 + 880 = 44000
Step 51: 44000 + 880 = 44880
Step 52: 44880 + 880 = 45760
Step 53: 45760 + 880 = 46640
Step 54: 46640 + 880 = 47520
Step 55: 47520 + 880 = 48400
Step 56: 48400 + 880 = 49280
Step 57: 49280 + 880 = 50160
Step 58: 50160 + 880 = 51040
Step 59: 51040 + 880 = 51920
Step 60: 51920 + 880 = 52800
Step 61: 52800 + 880 = 53680
Step 62: 53680 + 880 = 54560
Step 63: 54560 + 880 = 55440
Step 64: 55440 + 880 = 56320
Step 65: 56320 + 880 = 57200
Step 66: 57200 + 880 = 58080
Step 67: 58080 + 880 = 58960
Step 68: 58960 + 880 = 59840
Step 69: 59840 + 880 = 60720
Step 70: 60720 + 880 = 61600
Step 71: 61600 + 880 = 62480
Step 72: 62480 + 880 = 63360
Step 73: 63360 + 880 = 64240
Step 74: 64240 + 880 = 65120
Step 75: 65120 + 880 = 66000
Step 76: 66000 + 880 = 66880
Step 77: 66880 + 880 = 67760
Step 78: 67760 + 880 = 68640
Step 79: 68640 + 880 = 69520
Step 80: 69520 + 880 = 70400
Step 81: 70400 + 880 = 71280
Step 82: 71280 + 880 = 72160
Step 83: 72160 + 880 = 73040
Step 84: 73040 + 880 = 73920
Step 85: 73920 + 880 = 74800
Step 86: 74800 + 880 = 75680
Step 87: 75680 + 880 = 76560
Step 88: 76560 + 880 = 77440
Step 89: 77440 + 880 = 78320
Step 90: 78320 + 880 = 79200
Step 91: 79200 + 880 = 80080
Step 92: 80080 + 880 = 80960
Step 93: 80960 + 880 = 81840
Step 94: 81840 + 880 = 82720
Step 95: 82720 + 880 = 83600
Step 96: 83600 + 880 = 84480
Step 97: 84480 + 880 = 85360
Step 98: 85360 + 880 = 86240
Step 99: 86240 + 880 = 87120
Step 100: 87120 + 880 = 88000
Step 101: 88000 + 880 = 88880
Step 102: 88880 + 880 = 89760
Step 103: 89760 + 880 = 90640
Step 104: 90640 + 880 = 91520
Step 105: 91520 + 880 = 92400
Step 106: 92400 + 880 = 93280
Step 107: 93280 + 880 = 94160
Step 108: 94160 + 880 = 95040
Step 109: 95040 + 880 = 95920
Step 110: 95920 + 880 = 96800
Step 111: 96800 + 880 = 97680
Step 112: 97680 + 880 = 98560
Step 113: 98560 + 880 = 99440
Step 114: 99440 + 880 = 100320
Step 115: 100320 + 880 = 101200
Step 116: 101200 + 880 = 102080
Step 117: 102080 + 880 = 102960
Step 118: 102960 + 880 = 103840
Step 119: 103840 + 880 = 104720
Step 120: 104720 + 880 = 105600
Step 121: 105600 + 880 = 106480
Step 122: 106480 + 880 = 107360
Step 123: 107360 + 880 = 108240
Step 124: 108240 + 880 = 109120
Step 125: 109120 + 880 = 110000
Step 126: 110000 + 880 = 110880
Step 127: 110880 + 880 = 111760
Step 128: 111760 + 880 = 112640
Step 129: 112640 + 880 = 113520
Step 130: 113520 + 880 = 114400
Step 131: 114400 + 880 = 115280
Step 132: 115280 + 880 = 116160
Step 133: 116160 + 880 = 117040
Step 134: 117040 + 880 = 117920
Step 135: 117920 + 880 = 118800
Step 136: 118800 + 880 = 119680
Step 137: 119680 + 880 = 120560
Step 138: 120560 + 880 = 121440
Step 139: 121440 + 880 = 122320
Step 140: 122320 + 880 = 123200
Step 141: 123200 + 880 = 124080
Step 142: 124080 + 880 = 124960
Step 143: 124960 + 880 = 125840
Step 144: 125840 + 880 = 126720
Step 145: 126720 + 880 = 127600
Step 146: 127600 + 880 = 128480
Step 147: 128480 + 880 = 129360
Step 148: 129360 + 880 = 130240
Step 149: 130240 + 880 = 131120
Step 150: 131120 + 880 = 132000
Step 151: 132000 + 880 = 132880
Step 152: 132880 + 880 = 133760
Step 153: 133760 + 880 = 134640
Step 154: 134640 + 880 = 135520
Step 155: 135520 + 880 = 136400
Step 156: 136400 + 880 = 137280
Step 157: 137280 + 880 = 138160
Step 158: 138160 + 880 = 139040
Step 159: 139040 + 880 = 139920
Step 160: 139920 + 880 = 140800
Step 161: 140800 + 880 = 141680
Step 162: 141680 + 880 = 142560
Step 163: 142560 + 880 = 143440
Step 164: 143440 + 880 = 144320
Step 165: 144320 + 880 = 145200
Step 166: 145200 + 880 = 146080
Step 167: 146080 + 880 = 146960
Step 168: 146960 + 880 = 147840
Step 169: 147840 + 880 = 148720
Step 170: 148720 + 880 = 149600
Step 171: 149600 + 880 = 150480
Step 172: 150480 + 880 = 151360
Step 173: 151360 + 880 = 152240
Step 174: 152240 + 880 = 153120
Step 175: 153120 + 880 = 154000
Step 176: 154000 + 880 = 154880
Step 177: 154880 + 880 = 155760
Step 178: 155760 + 880 = 156640
Step 179: 156640 + 880 = 157520
Step 180: 157520 + 880 = 158400
Step 181: 158400 + 880 = 159280
Step 182: 159280 + 880 = 160160
Step 183: 160160 + 880 = 161040
Step 184: 161040 + 880 = 161920
Step 185: 161920 + 880 = 162800
Step 186: 162800 + 880 = 163680
Step 187: 163680 + 880 = 164560
Step 188: 164560 + 880 = 165440
Step 189: 165440 + 880 = 166320
Step 190: 166320 + 880 = 167200
Step 191: 167200 + 880 = 168080
Step 192: 168080 + 880 = 168960
Step 193: 168960 + 880 = 169840
Step 194: 169840 + 880 = 170720
Step 195: 170720 + 880 = 171600
Step 196: 171600 + 880 = 172480
Step 197: 172480 + 880 = 173360
Step 198: 173360 + 880 = 174240
Step 199: 174240 + 880 = 175120
Step 200: 175120 + 880 = 176000
Step 201: 176000 + 880 = 176880
Step 202: 176880 + 880 = 177760
Step 203: 177760 + 880 = 178640
Step 204: 178640 + 880 = 179520
Step 205: 179520 + 880 = 180400
Step 206: 180400 + 880 = 181280
Step 207: 181280 + 880 = 182160
Step 208: 182160 + 880 = 183040
Step 209: 183040 + 880 = 183920
Step 210: 183920 + 880 = 184800
Step 211: 184800 + 880 = 185680
Step 212: 185680 + 880 = 186560
Step 213: 186560 + 880 = 187440
Step 214: 187440 + 880 = 188320
Step 215: 188320 + 880 = 189200
Step 216: 189200 + 880 = 190080
Step 217: 190080 + 880 = 190960
Step 218: 190960 + 880 = 191840
Step 219: 191840 + 880 = 192720
Step 220: 192720 + 880 = 193600
Step 221: 193600 + 880 = 194480
Step 222: 194480 + 880 = 195360
Step 223: 195360 + 880 = 196240
Step 224: 196240 + 880 = 197120
Step 225: 197120 + 880 = 198000
Step 226: 198000 + 880 = 198880
Step 227: 198880 + 880 = 199760
Step 228: 199760 + 880 = 200640
Step 229: 200640 + 880 = 201520
Step 230: 201520 + 880 = 202400
Step 231: 202400 + 880 = 203280
Step 232: 203280 + 880 = 204160
Step 233: 204160 + 880 = 205040
Step 234: 205040 + 880 = 205920
Step 235: 205920 + 880 = 206800
Step 236: 206800 + 880 = 207680
Step 237: 207680 + 880 = 208560
Step 238: 208560 + 880 = 209440
Step 239: 209440 + 880 = 210320
Step 240: 210320 + 880 = 211200
Step 241: 211200 + 880 = 212080
Step 242: 212080 + 880 = 212960
Step 243: 212960 + 880 = 213840
Step 244: 213840 + 880 = 214720
Step 245: 214720 + 880 = 215600
Step 246: 215600 + 880 = 216480
Step 247: 216480 + 880 = 217360
Step 248: 217360 + 880 = 218240
Step 249: 218240 + 880 = 219120
Step 250: 219120 + 880 = 220000
Step 251: 220000 + 880 = 220880
Step 252: 220880 + 880 = 221760
Step 253: 221760 + 880 = 222640
Step 254: 222640 + 880 = 223520
Step 255: 223520 + 880 = 224400
Step 256: 224400 + 880 = 225280
Step 257: 225280 + 880 = 226160
Step 258: 226160 + 880 = 227040
Step 259: 227040 + 880 = 227920
Step 260: 227920 + 880 = 228800
Step 261: 228800 + 880 = 229680
Step 262: 229680 + 880 = 230560
Step 263: 230560 + 880 = 231440
Step 264: 231440 + 880 = 232320
Step 265: 232320 + 880 = 233200
Step 266: 233200 + 880 = 234080
Step 267: 234080 + 880 = 234960
Step 268: 234960 + 880 = 235840
Step 269: 235840 + 880 = 236720
Step 270: 236720 + 880 = 237600
Step 271: 237600 + 880 = 238480
Step 272: 238480 + 880 = 239360
Step 273: 239360 + 880 = 240240
Step 274: 240240 + 880 = 241120
Step 275: 241120 + 880 = 242000
Step 276: 242000 + 880 = 242880
Step 277: 242880 + 880 = 243760
Step 278: 243760 + 880 = 244640
Step 279: 244640 + 880 = 245520
Step 280: 245520 + 880 = 246400
Step 281: 246400 + 880 = 247280
Step 282: 247280 + 880 = 248160
Step 283: 248160 + 880 = 249040
Step 284: 249040 + 880 = 249920
Step 285: 249920 + 880 = 250800
Step 286: 250800 + 880 = 251680
Step 287: 251680 + 880 = 252560
Step 288: 252560 + 880 = 253440
Step 289: 253440 + 880 = 254320
Step 290: 254320 + 880 = 255200
Step 291: 255200 + 880 = 256080
Step 292: 256080 + 880 = 256960
Step 293: 256960 + 880 = 257840
Step 294: 257840 + 880 = 258720
Step 295: 258720 + 880 = 259600
Step 296: 259600 + 880 = 260480
Step 297: 260480 + 880 = 261360
Step 298: 261360 + 880 = 262240
Step 299: 262240 + 880 = 263120
Step 300: 263120 + 880 = 264000
Step 301: 264000 + 880 = 264880
Step 302: 264880 + 880 = 265760
Step 303: 265760 + 880 = 266640
Step 304: 266640 + 880 = 267520
Step 305: 267520 + 880 = 268400
Step 306: 268400 + 880 = 269280
Step 307: 269280 + 880 = 270160
Step 308: 270160 + 880 = 271040
Step 309: 271040 + 880 = 271920
Step 310: 271920 + 880 = 272800
Step 311: 272800 + 880 = 273680
Step 312: 273680 + 880 = 274560
Step 313: 274560 + 880 = 275440
Step 314: 275440 + 880 = 276320
Step 315: 276320 + 880 = 277200
Step 316: 277200 + 880 = 278080
Step 317: 278080 + 880 = 278960
Step 318: 278960 + 880 = 279840
Step 319: 279840 + 880 = 280720
Step 320: 280720 + 880 = 281600
Step 321: 281600 + 880 = 282480
Step 322: 282480 + 880 = 283360
Step 323: 283360 + 880 = 284240
Step 324: 284240 + 880 = 285120
Step 325: 285120 + 880 = 286000
Step 326: 286000 + 880 = 286880
Step 327: 286880 + 880 = 287760
Step 328: 287760 + 880 = 288640
Step 329: 288640 + 880 = 289520
Step 330: 289520 + 880 = 290400
Step 331: 290400 + 880 = 291280
Step 332: 291280 + 880 = 292160
Step 333: 292160 + 880 = 293040
Step 334: 293040 + 880 = 293920
Step 335: 293920 + 880 = 294800
Step 336: 294800 + 880 = 295680
Step 337: 295680 + 880 = 296560
Step 338: 296560 + 880 = 297440
Step 339: 297440 + 880 = 298320
Step 340: 298320 + 880 = 299200
Step 341: 299200 + 880 = 300080
Step 342: 300080 + 880 = 300960
Step 343: 300960 + 880 = 301840
Step 344: 301840 + 880 = 302720
Step 345: 302720 + 880 = 303600
Step 346: 303600 + 880 = 304480
Step 347: 304480 + 880 = 305360
Step 348: 305360 + 880 = 306240
Step 349: 306240 + 880 = 307120
Step 350: 307120 + 880 = 308000
Step 351: 308000 + 880 = 308880
Step 352: 308880 + 880 = 309760
Step 353: 309760 + 880 = 310640
Step 354: 310640 + 880 = 311520
Step 355: 311520 + 880 = 312400
Step 356: 312400 + 880 = 313280
Step 357: 313280 + 880 = 314160
Step 358: 314160 + 880 = 315040
Step 359: 315040 + 880 = 315920
Step 360: 315920 + 880 = 316800
Step 361: 316800 + 880 = 317680
Step 362: 317680 + 880 = 318560
Step 363: 318560 + 880 = 319440
Step 364: 319440 + 880 = 320320
Step 365: 320320 + 880 = 321200
Step 366: 321200 + 880 = 322080
Step 367: 322080 + 880 = 322960
Step 368: 322960 + 880 = 323840
Step 369: 323840 + 880 = 324720
Step 370: 324720 + 880 = 325600
Step 371: 325600 + 880 = 326480
Step 372: 326480 + 880 = 327360
Step 373: 327360 + 880 = 328240
Step 374: 328240 + 880 = 329120
Step 375: 329120 + 880 = 330000
Step 376: 330000 + 880 = 330880
Step 377: 330880 + 880 = 331760
Step 378: 331760 + 880 = 332640

So, 880*378 = 332640