OK, let's work through this together. We're starting with 52 and we're going to multiply it by 75, which means we add 52 to itself 75 times.
Step 1: 0 + 52 = 52
Step 2: 52 + 52 = 104
Step 3: 104 + 52 = 156
Step 4: 156 + 52 = 208
Step 5: 208 + 52 = 260
Step 6: 260 + 52 = 312
Step 7: 312 + 52 = 364
Step 8: 364 + 52 = 416
Step 9: 416 + 52 = 468
Step 10: 468 + 52 = 520
Step 11: 520 + 52 = 572
Step 12: 572 + 52 = 624
Step 13: 624 + 52 = 676
Step 14: 676 + 52 = 728
Step 15: 728 + 52 = 780
Step 16: 780 + 52 = 832
Step 17: 832 + 52 = 884
Step 18: 884 + 52 = 936
Step 19: 936 + 52 = 988
Step 20: 988 + 52 = 1040
Step 21: 1040 + 52 = 1092
Step 22: 1092 + 52 = 1144
Step 23: 1144 + 52 = 1196
Step 24: 1196 + 52 = 1248
Step 25: 1248 + 52 = 1300
Step 26: 1300 + 52 = 1352
Step 27: 1352 + 52 = 1404
Step 28: 1404 + 52 = 1456
Step 29: 1456 + 52 = 1508
Step 30: 1508 + 52 = 1560
Step 31: 1560 + 52 = 1612
Step 32: 1612 + 52 = 1664
Step 33: 1664 + 52 = 1716
Step 34: 1716 + 52 = 1768
Step 35: 1768 + 52 = 1820
Step 36: 1820 + 52 = 1872
Step 37: 1872 + 52 = 1924
Step 38: 1924 + 52 = 1976
Step 39: 1976 + 52 = 2028
Step 40: 2028 + 52 = 2080
Step 41: 2080 + 52 = 2132
Step 42: 2132 + 52 = 2184
Step 43: 2184 + 52 = 2236
Step 44: 2236 + 52 = 2288
Step 45: 2288 + 52 = 2340
Step 46: 2340 + 52 = 2392
Step 47: 2392 + 52 = 2444
Step 48: 2444 + 52 = 2496
Step 49: 2496 + 52 = 2548
Step 50: 2548 + 52 = 2600
Step 51: 2600 + 52 = 2652
Step 52: 2652 + 52 = 2704
Step 53: 2704 + 52 = 2756
Step 54: 2756 + 52 = 2808
Step 55: 2808 + 52 = 2860
Step 56: 2860 + 52 = 2912
Step 57: 2912 + 52 = 2964
Step 58: 2964 + 52 = 3016
Step 59: 3016 + 52 = 3068
Step 60: 3068 + 52 = 3120
Step 61: 3120 + 52 = 3172
Step 62: 3172 + 52 = 3224
Step 63: 3224 + 52 = 3276
Step 64: 3276 + 52 = 3328
Step 65: 3328 + 52 = 3380
Step 66: 3380 + 52 = 3432
Step 67: 3432 + 52 = 3484
Step 68: 3484 + 52 = 3536
Step 69: 3536 + 52 = 3588
Step 70: 3588 + 52 = 3640
Step 71: 3640 + 52 = 3692
Step 72: 3692 + 52 = 3744
Step 73: 3744 + 52 = 3796
Step 74: 3796 + 52 = 3848
Step 75: 3848 + 52 = 3900

So, 52*75 = 3900