Alright, let's solve this math problem step by step. First, we have the number 312. 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 312 and add it to itself 123 times.
Step 1: 0 + 312 = 312
Step 2: 312 + 312 = 624
Step 3: 624 + 312 = 936
Step 4: 936 + 312 = 1248
Step 5: 1248 + 312 = 1560
Step 6: 1560 + 312 = 1872
Step 7: 1872 + 312 = 2184
Step 8: 2184 + 312 = 2496
Step 9: 2496 + 312 = 2808
Step 10: 2808 + 312 = 3120
Step 11: 3120 + 312 = 3432
Step 12: 3432 + 312 = 3744
Step 13: 3744 + 312 = 4056
Step 14: 4056 + 312 = 4368
Step 15: 4368 + 312 = 4680
Step 16: 4680 + 312 = 4992
Step 17: 4992 + 312 = 5304
Step 18: 5304 + 312 = 5616
Step 19: 5616 + 312 = 5928
Step 20: 5928 + 312 = 6240
Step 21: 6240 + 312 = 6552
Step 22: 6552 + 312 = 6864
Step 23: 6864 + 312 = 7176
Step 24: 7176 + 312 = 7488
Step 25: 7488 + 312 = 7800
Step 26: 7800 + 312 = 8112
Step 27: 8112 + 312 = 8424
Step 28: 8424 + 312 = 8736
Step 29: 8736 + 312 = 9048
Step 30: 9048 + 312 = 9360
Step 31: 9360 + 312 = 9672
Step 32: 9672 + 312 = 9984
Step 33: 9984 + 312 = 10296
Step 34: 10296 + 312 = 10608
Step 35: 10608 + 312 = 10920
Step 36: 10920 + 312 = 11232
Step 37: 11232 + 312 = 11544
Step 38: 11544 + 312 = 11856
Step 39: 11856 + 312 = 12168
Step 40: 12168 + 312 = 12480
Step 41: 12480 + 312 = 12792
Step 42: 12792 + 312 = 13104
Step 43: 13104 + 312 = 13416
Step 44: 13416 + 312 = 13728
Step 45: 13728 + 312 = 14040
Step 46: 14040 + 312 = 14352
Step 47: 14352 + 312 = 14664
Step 48: 14664 + 312 = 14976
Step 49: 14976 + 312 = 15288
Step 50: 15288 + 312 = 15600
Step 51: 15600 + 312 = 15912
Step 52: 15912 + 312 = 16224
Step 53: 16224 + 312 = 16536
Step 54: 16536 + 312 = 16848
Step 55: 16848 + 312 = 17160
Step 56: 17160 + 312 = 17472
Step 57: 17472 + 312 = 17784
Step 58: 17784 + 312 = 18096
Step 59: 18096 + 312 = 18408
Step 60: 18408 + 312 = 18720
Step 61: 18720 + 312 = 19032
Step 62: 19032 + 312 = 19344
Step 63: 19344 + 312 = 19656
Step 64: 19656 + 312 = 19968
Step 65: 19968 + 312 = 20280
Step 66: 20280 + 312 = 20592
Step 67: 20592 + 312 = 20904
Step 68: 20904 + 312 = 21216
Step 69: 21216 + 312 = 21528
Step 70: 21528 + 312 = 21840
Step 71: 21840 + 312 = 22152
Step 72: 22152 + 312 = 22464
Step 73: 22464 + 312 = 22776
Step 74: 22776 + 312 = 23088
Step 75: 23088 + 312 = 23400
Step 76: 23400 + 312 = 23712
Step 77: 23712 + 312 = 24024
Step 78: 24024 + 312 = 24336
Step 79: 24336 + 312 = 24648
Step 80: 24648 + 312 = 24960
Step 81: 24960 + 312 = 25272
Step 82: 25272 + 312 = 25584
Step 83: 25584 + 312 = 25896
Step 84: 25896 + 312 = 26208
Step 85: 26208 + 312 = 26520
Step 86: 26520 + 312 = 26832
Step 87: 26832 + 312 = 27144
Step 88: 27144 + 312 = 27456
Step 89: 27456 + 312 = 27768
Step 90: 27768 + 312 = 28080
Step 91: 28080 + 312 = 28392
Step 92: 28392 + 312 = 28704
Step 93: 28704 + 312 = 29016
Step 94: 29016 + 312 = 29328
Step 95: 29328 + 312 = 29640
Step 96: 29640 + 312 = 29952
Step 97: 29952 + 312 = 30264
Step 98: 30264 + 312 = 30576
Step 99: 30576 + 312 = 30888
Step 100: 30888 + 312 = 31200
Step 101: 31200 + 312 = 31512
Step 102: 31512 + 312 = 31824
Step 103: 31824 + 312 = 32136
Step 104: 32136 + 312 = 32448
Step 105: 32448 + 312 = 32760
Step 106: 32760 + 312 = 33072
Step 107: 33072 + 312 = 33384
Step 108: 33384 + 312 = 33696
Step 109: 33696 + 312 = 34008
Step 110: 34008 + 312 = 34320
Step 111: 34320 + 312 = 34632
Step 112: 34632 + 312 = 34944
Step 113: 34944 + 312 = 35256
Step 114: 35256 + 312 = 35568
Step 115: 35568 + 312 = 35880
Step 116: 35880 + 312 = 36192
Step 117: 36192 + 312 = 36504
Step 118: 36504 + 312 = 36816
Step 119: 36816 + 312 = 37128
Step 120: 37128 + 312 = 37440
Step 121: 37440 + 312 = 37752
Step 122: 37752 + 312 = 38064
Step 123: 38064 + 312 = 38376

So, 312*123 = 38376