Alright, let's solve this math problem step by step. First, we have the number 670. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 123. So, we're going to take the number 670 and add it to itself 123 times.
Step 1: 0 + 670 = 670
Step 2: 670 + 670 = 1340
Step 3: 1340 + 670 = 2010
Step 4: 2010 + 670 = 2680
Step 5: 2680 + 670 = 3350
Step 6: 3350 + 670 = 4020
Step 7: 4020 + 670 = 4690
Step 8: 4690 + 670 = 5360
Step 9: 5360 + 670 = 6030
Step 10: 6030 + 670 = 6700
Step 11: 6700 + 670 = 7370
Step 12: 7370 + 670 = 8040
Step 13: 8040 + 670 = 8710
Step 14: 8710 + 670 = 9380
Step 15: 9380 + 670 = 10050
Step 16: 10050 + 670 = 10720
Step 17: 10720 + 670 = 11390
Step 18: 11390 + 670 = 12060
Step 19: 12060 + 670 = 12730
Step 20: 12730 + 670 = 13400
Step 21: 13400 + 670 = 14070
Step 22: 14070 + 670 = 14740
Step 23: 14740 + 670 = 15410
Step 24: 15410 + 670 = 16080
Step 25: 16080 + 670 = 16750
Step 26: 16750 + 670 = 17420
Step 27: 17420 + 670 = 18090
Step 28: 18090 + 670 = 18760
Step 29: 18760 + 670 = 19430
Step 30: 19430 + 670 = 20100
Step 31: 20100 + 670 = 20770
Step 32: 20770 + 670 = 21440
Step 33: 21440 + 670 = 22110
Step 34: 22110 + 670 = 22780
Step 35: 22780 + 670 = 23450
Step 36: 23450 + 670 = 24120
Step 37: 24120 + 670 = 24790
Step 38: 24790 + 670 = 25460
Step 39: 25460 + 670 = 26130
Step 40: 26130 + 670 = 26800
Step 41: 26800 + 670 = 27470
Step 42: 27470 + 670 = 28140
Step 43: 28140 + 670 = 28810
Step 44: 28810 + 670 = 29480
Step 45: 29480 + 670 = 30150
Step 46: 30150 + 670 = 30820
Step 47: 30820 + 670 = 31490
Step 48: 31490 + 670 = 32160
Step 49: 32160 + 670 = 32830
Step 50: 32830 + 670 = 33500
Step 51: 33500 + 670 = 34170
Step 52: 34170 + 670 = 34840
Step 53: 34840 + 670 = 35510
Step 54: 35510 + 670 = 36180
Step 55: 36180 + 670 = 36850
Step 56: 36850 + 670 = 37520
Step 57: 37520 + 670 = 38190
Step 58: 38190 + 670 = 38860
Step 59: 38860 + 670 = 39530
Step 60: 39530 + 670 = 40200
Step 61: 40200 + 670 = 40870
Step 62: 40870 + 670 = 41540
Step 63: 41540 + 670 = 42210
Step 64: 42210 + 670 = 42880
Step 65: 42880 + 670 = 43550
Step 66: 43550 + 670 = 44220
Step 67: 44220 + 670 = 44890
Step 68: 44890 + 670 = 45560
Step 69: 45560 + 670 = 46230
Step 70: 46230 + 670 = 46900
Step 71: 46900 + 670 = 47570
Step 72: 47570 + 670 = 48240
Step 73: 48240 + 670 = 48910
Step 74: 48910 + 670 = 49580
Step 75: 49580 + 670 = 50250
Step 76: 50250 + 670 = 50920
Step 77: 50920 + 670 = 51590
Step 78: 51590 + 670 = 52260
Step 79: 52260 + 670 = 52930
Step 80: 52930 + 670 = 53600
Step 81: 53600 + 670 = 54270
Step 82: 54270 + 670 = 54940
Step 83: 54940 + 670 = 55610
Step 84: 55610 + 670 = 56280
Step 85: 56280 + 670 = 56950
Step 86: 56950 + 670 = 57620
Step 87: 57620 + 670 = 58290
Step 88: 58290 + 670 = 58960
Step 89: 58960 + 670 = 59630
Step 90: 59630 + 670 = 60300
Step 91: 60300 + 670 = 60970
Step 92: 60970 + 670 = 61640
Step 93: 61640 + 670 = 62310
Step 94: 62310 + 670 = 62980
Step 95: 62980 + 670 = 63650
Step 96: 63650 + 670 = 64320
Step 97: 64320 + 670 = 64990
Step 98: 64990 + 670 = 65660
Step 99: 65660 + 670 = 66330
Step 100: 66330 + 670 = 67000
Step 101: 67000 + 670 = 67670
Step 102: 67670 + 670 = 68340
Step 103: 68340 + 670 = 69010
Step 104: 69010 + 670 = 69680
Step 105: 69680 + 670 = 70350
Step 106: 70350 + 670 = 71020
Step 107: 71020 + 670 = 71690
Step 108: 71690 + 670 = 72360
Step 109: 72360 + 670 = 73030
Step 110: 73030 + 670 = 73700
Step 111: 73700 + 670 = 74370
Step 112: 74370 + 670 = 75040
Step 113: 75040 + 670 = 75710
Step 114: 75710 + 670 = 76380
Step 115: 76380 + 670 = 77050
Step 116: 77050 + 670 = 77720
Step 117: 77720 + 670 = 78390
Step 118: 78390 + 670 = 79060
Step 119: 79060 + 670 = 79730
Step 120: 79730 + 670 = 80400
Step 121: 80400 + 670 = 81070
Step 122: 81070 + 670 = 81740
Step 123: 81740 + 670 = 82410

So, 670*123 = 82410