Alright, let's solve this math problem step by step. First, we have the number 135. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 75. So, we're going to take the number 135 and add it to itself 75 times.
Step 1: 0 + 135 = 135
Step 2: 135 + 135 = 270
Step 3: 270 + 135 = 405
Step 4: 405 + 135 = 540
Step 5: 540 + 135 = 675
Step 6: 675 + 135 = 810
Step 7: 810 + 135 = 945
Step 8: 945 + 135 = 1080
Step 9: 1080 + 135 = 1215
Step 10: 1215 + 135 = 1350
Step 11: 1350 + 135 = 1485
Step 12: 1485 + 135 = 1620
Step 13: 1620 + 135 = 1755
Step 14: 1755 + 135 = 1890
Step 15: 1890 + 135 = 2025
Step 16: 2025 + 135 = 2160
Step 17: 2160 + 135 = 2295
Step 18: 2295 + 135 = 2430
Step 19: 2430 + 135 = 2565
Step 20: 2565 + 135 = 2700
Step 21: 2700 + 135 = 2835
Step 22: 2835 + 135 = 2970
Step 23: 2970 + 135 = 3105
Step 24: 3105 + 135 = 3240
Step 25: 3240 + 135 = 3375
Step 26: 3375 + 135 = 3510
Step 27: 3510 + 135 = 3645
Step 28: 3645 + 135 = 3780
Step 29: 3780 + 135 = 3915
Step 30: 3915 + 135 = 4050
Step 31: 4050 + 135 = 4185
Step 32: 4185 + 135 = 4320
Step 33: 4320 + 135 = 4455
Step 34: 4455 + 135 = 4590
Step 35: 4590 + 135 = 4725
Step 36: 4725 + 135 = 4860
Step 37: 4860 + 135 = 4995
Step 38: 4995 + 135 = 5130
Step 39: 5130 + 135 = 5265
Step 40: 5265 + 135 = 5400
Step 41: 5400 + 135 = 5535
Step 42: 5535 + 135 = 5670
Step 43: 5670 + 135 = 5805
Step 44: 5805 + 135 = 5940
Step 45: 5940 + 135 = 6075
Step 46: 6075 + 135 = 6210
Step 47: 6210 + 135 = 6345
Step 48: 6345 + 135 = 6480
Step 49: 6480 + 135 = 6615
Step 50: 6615 + 135 = 6750
Step 51: 6750 + 135 = 6885
Step 52: 6885 + 135 = 7020
Step 53: 7020 + 135 = 7155
Step 54: 7155 + 135 = 7290
Step 55: 7290 + 135 = 7425
Step 56: 7425 + 135 = 7560
Step 57: 7560 + 135 = 7695
Step 58: 7695 + 135 = 7830
Step 59: 7830 + 135 = 7965
Step 60: 7965 + 135 = 8100
Step 61: 8100 + 135 = 8235
Step 62: 8235 + 135 = 8370
Step 63: 8370 + 135 = 8505
Step 64: 8505 + 135 = 8640
Step 65: 8640 + 135 = 8775
Step 66: 8775 + 135 = 8910
Step 67: 8910 + 135 = 9045
Step 68: 9045 + 135 = 9180
Step 69: 9180 + 135 = 9315
Step 70: 9315 + 135 = 9450
Step 71: 9450 + 135 = 9585
Step 72: 9585 + 135 = 9720
Step 73: 9720 + 135 = 9855
Step 74: 9855 + 135 = 9990
Step 75: 9990 + 135 = 10125

So, 135*75 = 10125