Alright, let's solve this math problem step by step. First, we have the number 648. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 425. So, we're going to take the number 648 and add it to itself 425 times.
Step 1: 0 + 648 = 648
Step 2: 648 + 648 = 1296
Step 3: 1296 + 648 = 1944
Step 4: 1944 + 648 = 2592
Step 5: 2592 + 648 = 3240
Step 6: 3240 + 648 = 3888
Step 7: 3888 + 648 = 4536
Step 8: 4536 + 648 = 5184
Step 9: 5184 + 648 = 5832
Step 10: 5832 + 648 = 6480
Step 11: 6480 + 648 = 7128
Step 12: 7128 + 648 = 7776
Step 13: 7776 + 648 = 8424
Step 14: 8424 + 648 = 9072
Step 15: 9072 + 648 = 9720
Step 16: 9720 + 648 = 10368
Step 17: 10368 + 648 = 11016
Step 18: 11016 + 648 = 11664
Step 19: 11664 + 648 = 12312
Step 20: 12312 + 648 = 12960
Step 21: 12960 + 648 = 13608
Step 22: 13608 + 648 = 14256
Step 23: 14256 + 648 = 14904
Step 24: 14904 + 648 = 15552
Step 25: 15552 + 648 = 16200
Step 26: 16200 + 648 = 16848
Step 27: 16848 + 648 = 17496
Step 28: 17496 + 648 = 18144
Step 29: 18144 + 648 = 18792
Step 30: 18792 + 648 = 19440
Step 31: 19440 + 648 = 20088
Step 32: 20088 + 648 = 20736
Step 33: 20736 + 648 = 21384
Step 34: 21384 + 648 = 22032
Step 35: 22032 + 648 = 22680
Step 36: 22680 + 648 = 23328
Step 37: 23328 + 648 = 23976
Step 38: 23976 + 648 = 24624
Step 39: 24624 + 648 = 25272
Step 40: 25272 + 648 = 25920
Step 41: 25920 + 648 = 26568
Step 42: 26568 + 648 = 27216
Step 43: 27216 + 648 = 27864
Step 44: 27864 + 648 = 28512
Step 45: 28512 + 648 = 29160
Step 46: 29160 + 648 = 29808
Step 47: 29808 + 648 = 30456
Step 48: 30456 + 648 = 31104
Step 49: 31104 + 648 = 31752
Step 50: 31752 + 648 = 32400
Step 51: 32400 + 648 = 33048
Step 52: 33048 + 648 = 33696
Step 53: 33696 + 648 = 34344
Step 54: 34344 + 648 = 34992
Step 55: 34992 + 648 = 35640
Step 56: 35640 + 648 = 36288
Step 57: 36288 + 648 = 36936
Step 58: 36936 + 648 = 37584
Step 59: 37584 + 648 = 38232
Step 60: 38232 + 648 = 38880
Step 61: 38880 + 648 = 39528
Step 62: 39528 + 648 = 40176
Step 63: 40176 + 648 = 40824
Step 64: 40824 + 648 = 41472
Step 65: 41472 + 648 = 42120
Step 66: 42120 + 648 = 42768
Step 67: 42768 + 648 = 43416
Step 68: 43416 + 648 = 44064
Step 69: 44064 + 648 = 44712
Step 70: 44712 + 648 = 45360
Step 71: 45360 + 648 = 46008
Step 72: 46008 + 648 = 46656
Step 73: 46656 + 648 = 47304
Step 74: 47304 + 648 = 47952
Step 75: 47952 + 648 = 48600
Step 76: 48600 + 648 = 49248
Step 77: 49248 + 648 = 49896
Step 78: 49896 + 648 = 50544
Step 79: 50544 + 648 = 51192
Step 80: 51192 + 648 = 51840
Step 81: 51840 + 648 = 52488
Step 82: 52488 + 648 = 53136
Step 83: 53136 + 648 = 53784
Step 84: 53784 + 648 = 54432
Step 85: 54432 + 648 = 55080
Step 86: 55080 + 648 = 55728
Step 87: 55728 + 648 = 56376
Step 88: 56376 + 648 = 57024
Step 89: 57024 + 648 = 57672
Step 90: 57672 + 648 = 58320
Step 91: 58320 + 648 = 58968
Step 92: 58968 + 648 = 59616
Step 93: 59616 + 648 = 60264
Step 94: 60264 + 648 = 60912
Step 95: 60912 + 648 = 61560
Step 96: 61560 + 648 = 62208
Step 97: 62208 + 648 = 62856
Step 98: 62856 + 648 = 63504
Step 99: 63504 + 648 = 64152
Step 100: 64152 + 648 = 64800
Step 101: 64800 + 648 = 65448
Step 102: 65448 + 648 = 66096
Step 103: 66096 + 648 = 66744
Step 104: 66744 + 648 = 67392
Step 105: 67392 + 648 = 68040
Step 106: 68040 + 648 = 68688
Step 107: 68688 + 648 = 69336
Step 108: 69336 + 648 = 69984
Step 109: 69984 + 648 = 70632
Step 110: 70632 + 648 = 71280
Step 111: 71280 + 648 = 71928
Step 112: 71928 + 648 = 72576
Step 113: 72576 + 648 = 73224
Step 114: 73224 + 648 = 73872
Step 115: 73872 + 648 = 74520
Step 116: 74520 + 648 = 75168
Step 117: 75168 + 648 = 75816
Step 118: 75816 + 648 = 76464
Step 119: 76464 + 648 = 77112
Step 120: 77112 + 648 = 77760
Step 121: 77760 + 648 = 78408
Step 122: 78408 + 648 = 79056
Step 123: 79056 + 648 = 79704
Step 124: 79704 + 648 = 80352
Step 125: 80352 + 648 = 81000
Step 126: 81000 + 648 = 81648
Step 127: 81648 + 648 = 82296
Step 128: 82296 + 648 = 82944
Step 129: 82944 + 648 = 83592
Step 130: 83592 + 648 = 84240
Step 131: 84240 + 648 = 84888
Step 132: 84888 + 648 = 85536
Step 133: 85536 + 648 = 86184
Step 134: 86184 + 648 = 86832
Step 135: 86832 + 648 = 87480
Step 136: 87480 + 648 = 88128
Step 137: 88128 + 648 = 88776
Step 138: 88776 + 648 = 89424
Step 139: 89424 + 648 = 90072
Step 140: 90072 + 648 = 90720
Step 141: 90720 + 648 = 91368
Step 142: 91368 + 648 = 92016
Step 143: 92016 + 648 = 92664
Step 144: 92664 + 648 = 93312
Step 145: 93312 + 648 = 93960
Step 146: 93960 + 648 = 94608
Step 147: 94608 + 648 = 95256
Step 148: 95256 + 648 = 95904
Step 149: 95904 + 648 = 96552
Step 150: 96552 + 648 = 97200
Step 151: 97200 + 648 = 97848
Step 152: 97848 + 648 = 98496
Step 153: 98496 + 648 = 99144
Step 154: 99144 + 648 = 99792
Step 155: 99792 + 648 = 100440
Step 156: 100440 + 648 = 101088
Step 157: 101088 + 648 = 101736
Step 158: 101736 + 648 = 102384
Step 159: 102384 + 648 = 103032
Step 160: 103032 + 648 = 103680
Step 161: 103680 + 648 = 104328
Step 162: 104328 + 648 = 104976
Step 163: 104976 + 648 = 105624
Step 164: 105624 + 648 = 106272
Step 165: 106272 + 648 = 106920
Step 166: 106920 + 648 = 107568
Step 167: 107568 + 648 = 108216
Step 168: 108216 + 648 = 108864
Step 169: 108864 + 648 = 109512
Step 170: 109512 + 648 = 110160
Step 171: 110160 + 648 = 110808
Step 172: 110808 + 648 = 111456
Step 173: 111456 + 648 = 112104
Step 174: 112104 + 648 = 112752
Step 175: 112752 + 648 = 113400
Step 176: 113400 + 648 = 114048
Step 177: 114048 + 648 = 114696
Step 178: 114696 + 648 = 115344
Step 179: 115344 + 648 = 115992
Step 180: 115992 + 648 = 116640
Step 181: 116640 + 648 = 117288
Step 182: 117288 + 648 = 117936
Step 183: 117936 + 648 = 118584
Step 184: 118584 + 648 = 119232
Step 185: 119232 + 648 = 119880
Step 186: 119880 + 648 = 120528
Step 187: 120528 + 648 = 121176
Step 188: 121176 + 648 = 121824
Step 189: 121824 + 648 = 122472
Step 190: 122472 + 648 = 123120
Step 191: 123120 + 648 = 123768
Step 192: 123768 + 648 = 124416
Step 193: 124416 + 648 = 125064
Step 194: 125064 + 648 = 125712
Step 195: 125712 + 648 = 126360
Step 196: 126360 + 648 = 127008
Step 197: 127008 + 648 = 127656
Step 198: 127656 + 648 = 128304
Step 199: 128304 + 648 = 128952
Step 200: 128952 + 648 = 129600
Step 201: 129600 + 648 = 130248
Step 202: 130248 + 648 = 130896
Step 203: 130896 + 648 = 131544
Step 204: 131544 + 648 = 132192
Step 205: 132192 + 648 = 132840
Step 206: 132840 + 648 = 133488
Step 207: 133488 + 648 = 134136
Step 208: 134136 + 648 = 134784
Step 209: 134784 + 648 = 135432
Step 210: 135432 + 648 = 136080
Step 211: 136080 + 648 = 136728
Step 212: 136728 + 648 = 137376
Step 213: 137376 + 648 = 138024
Step 214: 138024 + 648 = 138672
Step 215: 138672 + 648 = 139320
Step 216: 139320 + 648 = 139968
Step 217: 139968 + 648 = 140616
Step 218: 140616 + 648 = 141264
Step 219: 141264 + 648 = 141912
Step 220: 141912 + 648 = 142560
Step 221: 142560 + 648 = 143208
Step 222: 143208 + 648 = 143856
Step 223: 143856 + 648 = 144504
Step 224: 144504 + 648 = 145152
Step 225: 145152 + 648 = 145800
Step 226: 145800 + 648 = 146448
Step 227: 146448 + 648 = 147096
Step 228: 147096 + 648 = 147744
Step 229: 147744 + 648 = 148392
Step 230: 148392 + 648 = 149040
Step 231: 149040 + 648 = 149688
Step 232: 149688 + 648 = 150336
Step 233: 150336 + 648 = 150984
Step 234: 150984 + 648 = 151632
Step 235: 151632 + 648 = 152280
Step 236: 152280 + 648 = 152928
Step 237: 152928 + 648 = 153576
Step 238: 153576 + 648 = 154224
Step 239: 154224 + 648 = 154872
Step 240: 154872 + 648 = 155520
Step 241: 155520 + 648 = 156168
Step 242: 156168 + 648 = 156816
Step 243: 156816 + 648 = 157464
Step 244: 157464 + 648 = 158112
Step 245: 158112 + 648 = 158760
Step 246: 158760 + 648 = 159408
Step 247: 159408 + 648 = 160056
Step 248: 160056 + 648 = 160704
Step 249: 160704 + 648 = 161352
Step 250: 161352 + 648 = 162000
Step 251: 162000 + 648 = 162648
Step 252: 162648 + 648 = 163296
Step 253: 163296 + 648 = 163944
Step 254: 163944 + 648 = 164592
Step 255: 164592 + 648 = 165240
Step 256: 165240 + 648 = 165888
Step 257: 165888 + 648 = 166536
Step 258: 166536 + 648 = 167184
Step 259: 167184 + 648 = 167832
Step 260: 167832 + 648 = 168480
Step 261: 168480 + 648 = 169128
Step 262: 169128 + 648 = 169776
Step 263: 169776 + 648 = 170424
Step 264: 170424 + 648 = 171072
Step 265: 171072 + 648 = 171720
Step 266: 171720 + 648 = 172368
Step 267: 172368 + 648 = 173016
Step 268: 173016 + 648 = 173664
Step 269: 173664 + 648 = 174312
Step 270: 174312 + 648 = 174960
Step 271: 174960 + 648 = 175608
Step 272: 175608 + 648 = 176256
Step 273: 176256 + 648 = 176904
Step 274: 176904 + 648 = 177552
Step 275: 177552 + 648 = 178200
Step 276: 178200 + 648 = 178848
Step 277: 178848 + 648 = 179496
Step 278: 179496 + 648 = 180144
Step 279: 180144 + 648 = 180792
Step 280: 180792 + 648 = 181440
Step 281: 181440 + 648 = 182088
Step 282: 182088 + 648 = 182736
Step 283: 182736 + 648 = 183384
Step 284: 183384 + 648 = 184032
Step 285: 184032 + 648 = 184680
Step 286: 184680 + 648 = 185328
Step 287: 185328 + 648 = 185976
Step 288: 185976 + 648 = 186624
Step 289: 186624 + 648 = 187272
Step 290: 187272 + 648 = 187920
Step 291: 187920 + 648 = 188568
Step 292: 188568 + 648 = 189216
Step 293: 189216 + 648 = 189864
Step 294: 189864 + 648 = 190512
Step 295: 190512 + 648 = 191160
Step 296: 191160 + 648 = 191808
Step 297: 191808 + 648 = 192456
Step 298: 192456 + 648 = 193104
Step 299: 193104 + 648 = 193752
Step 300: 193752 + 648 = 194400
Step 301: 194400 + 648 = 195048
Step 302: 195048 + 648 = 195696
Step 303: 195696 + 648 = 196344
Step 304: 196344 + 648 = 196992
Step 305: 196992 + 648 = 197640
Step 306: 197640 + 648 = 198288
Step 307: 198288 + 648 = 198936
Step 308: 198936 + 648 = 199584
Step 309: 199584 + 648 = 200232
Step 310: 200232 + 648 = 200880
Step 311: 200880 + 648 = 201528
Step 312: 201528 + 648 = 202176
Step 313: 202176 + 648 = 202824
Step 314: 202824 + 648 = 203472
Step 315: 203472 + 648 = 204120
Step 316: 204120 + 648 = 204768
Step 317: 204768 + 648 = 205416
Step 318: 205416 + 648 = 206064
Step 319: 206064 + 648 = 206712
Step 320: 206712 + 648 = 207360
Step 321: 207360 + 648 = 208008
Step 322: 208008 + 648 = 208656
Step 323: 208656 + 648 = 209304
Step 324: 209304 + 648 = 209952
Step 325: 209952 + 648 = 210600
Step 326: 210600 + 648 = 211248
Step 327: 211248 + 648 = 211896
Step 328: 211896 + 648 = 212544
Step 329: 212544 + 648 = 213192
Step 330: 213192 + 648 = 213840
Step 331: 213840 + 648 = 214488
Step 332: 214488 + 648 = 215136
Step 333: 215136 + 648 = 215784
Step 334: 215784 + 648 = 216432
Step 335: 216432 + 648 = 217080
Step 336: 217080 + 648 = 217728
Step 337: 217728 + 648 = 218376
Step 338: 218376 + 648 = 219024
Step 339: 219024 + 648 = 219672
Step 340: 219672 + 648 = 220320
Step 341: 220320 + 648 = 220968
Step 342: 220968 + 648 = 221616
Step 343: 221616 + 648 = 222264
Step 344: 222264 + 648 = 222912
Step 345: 222912 + 648 = 223560
Step 346: 223560 + 648 = 224208
Step 347: 224208 + 648 = 224856
Step 348: 224856 + 648 = 225504
Step 349: 225504 + 648 = 226152
Step 350: 226152 + 648 = 226800
Step 351: 226800 + 648 = 227448
Step 352: 227448 + 648 = 228096
Step 353: 228096 + 648 = 228744
Step 354: 228744 + 648 = 229392
Step 355: 229392 + 648 = 230040
Step 356: 230040 + 648 = 230688
Step 357: 230688 + 648 = 231336
Step 358: 231336 + 648 = 231984
Step 359: 231984 + 648 = 232632
Step 360: 232632 + 648 = 233280
Step 361: 233280 + 648 = 233928
Step 362: 233928 + 648 = 234576
Step 363: 234576 + 648 = 235224
Step 364: 235224 + 648 = 235872
Step 365: 235872 + 648 = 236520
Step 366: 236520 + 648 = 237168
Step 367: 237168 + 648 = 237816
Step 368: 237816 + 648 = 238464
Step 369: 238464 + 648 = 239112
Step 370: 239112 + 648 = 239760
Step 371: 239760 + 648 = 240408
Step 372: 240408 + 648 = 241056
Step 373: 241056 + 648 = 241704
Step 374: 241704 + 648 = 242352
Step 375: 242352 + 648 = 243000
Step 376: 243000 + 648 = 243648
Step 377: 243648 + 648 = 244296
Step 378: 244296 + 648 = 244944
Step 379: 244944 + 648 = 245592
Step 380: 245592 + 648 = 246240
Step 381: 246240 + 648 = 246888
Step 382: 246888 + 648 = 247536
Step 383: 247536 + 648 = 248184
Step 384: 248184 + 648 = 248832
Step 385: 248832 + 648 = 249480
Step 386: 249480 + 648 = 250128
Step 387: 250128 + 648 = 250776
Step 388: 250776 + 648 = 251424
Step 389: 251424 + 648 = 252072
Step 390: 252072 + 648 = 252720
Step 391: 252720 + 648 = 253368
Step 392: 253368 + 648 = 254016
Step 393: 254016 + 648 = 254664
Step 394: 254664 + 648 = 255312
Step 395: 255312 + 648 = 255960
Step 396: 255960 + 648 = 256608
Step 397: 256608 + 648 = 257256
Step 398: 257256 + 648 = 257904
Step 399: 257904 + 648 = 258552
Step 400: 258552 + 648 = 259200
Step 401: 259200 + 648 = 259848
Step 402: 259848 + 648 = 260496
Step 403: 260496 + 648 = 261144
Step 404: 261144 + 648 = 261792
Step 405: 261792 + 648 = 262440
Step 406: 262440 + 648 = 263088
Step 407: 263088 + 648 = 263736
Step 408: 263736 + 648 = 264384
Step 409: 264384 + 648 = 265032
Step 410: 265032 + 648 = 265680
Step 411: 265680 + 648 = 266328
Step 412: 266328 + 648 = 266976
Step 413: 266976 + 648 = 267624
Step 414: 267624 + 648 = 268272
Step 415: 268272 + 648 = 268920
Step 416: 268920 + 648 = 269568
Step 417: 269568 + 648 = 270216
Step 418: 270216 + 648 = 270864
Step 419: 270864 + 648 = 271512
Step 420: 271512 + 648 = 272160
Step 421: 272160 + 648 = 272808
Step 422: 272808 + 648 = 273456
Step 423: 273456 + 648 = 274104
Step 424: 274104 + 648 = 274752
Step 425: 274752 + 648 = 275400

So, 648*425 = 275400