Alright, let's solve this math problem step by step. First, we have the number 105. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 38. So, we're going to take the number 105 and add it to itself 38 times.
Step 1: 0 + 105 = 105
Step 2: 105 + 105 = 210
Step 3: 210 + 105 = 315
Step 4: 315 + 105 = 420
Step 5: 420 + 105 = 525
Step 6: 525 + 105 = 630
Step 7: 630 + 105 = 735
Step 8: 735 + 105 = 840
Step 9: 840 + 105 = 945
Step 10: 945 + 105 = 1050
Step 11: 1050 + 105 = 1155
Step 12: 1155 + 105 = 1260
Step 13: 1260 + 105 = 1365
Step 14: 1365 + 105 = 1470
Step 15: 1470 + 105 = 1575
Step 16: 1575 + 105 = 1680
Step 17: 1680 + 105 = 1785
Step 18: 1785 + 105 = 1890
Step 19: 1890 + 105 = 1995
Step 20: 1995 + 105 = 2100
Step 21: 2100 + 105 = 2205
Step 22: 2205 + 105 = 2310
Step 23: 2310 + 105 = 2415
Step 24: 2415 + 105 = 2520
Step 25: 2520 + 105 = 2625
Step 26: 2625 + 105 = 2730
Step 27: 2730 + 105 = 2835
Step 28: 2835 + 105 = 2940
Step 29: 2940 + 105 = 3045
Step 30: 3045 + 105 = 3150
Step 31: 3150 + 105 = 3255
Step 32: 3255 + 105 = 3360
Step 33: 3360 + 105 = 3465
Step 34: 3465 + 105 = 3570
Step 35: 3570 + 105 = 3675
Step 36: 3675 + 105 = 3780
Step 37: 3780 + 105 = 3885
Step 38: 3885 + 105 = 3990

So, 105*38 = 3990