Alright, let's solve this math problem step by step. First, we have the number 153. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 85. So, we're going to take the number 153 and add it to itself 85 times.
Step 1: 0 + 153 = 153
Step 2: 153 + 153 = 306
Step 3: 306 + 153 = 459
Step 4: 459 + 153 = 612
Step 5: 612 + 153 = 765
Step 6: 765 + 153 = 918
Step 7: 918 + 153 = 1071
Step 8: 1071 + 153 = 1224
Step 9: 1224 + 153 = 1377
Step 10: 1377 + 153 = 1530
Step 11: 1530 + 153 = 1683
Step 12: 1683 + 153 = 1836
Step 13: 1836 + 153 = 1989
Step 14: 1989 + 153 = 2142
Step 15: 2142 + 153 = 2295
Step 16: 2295 + 153 = 2448
Step 17: 2448 + 153 = 2601
Step 18: 2601 + 153 = 2754
Step 19: 2754 + 153 = 2907
Step 20: 2907 + 153 = 3060
Step 21: 3060 + 153 = 3213
Step 22: 3213 + 153 = 3366
Step 23: 3366 + 153 = 3519
Step 24: 3519 + 153 = 3672
Step 25: 3672 + 153 = 3825
Step 26: 3825 + 153 = 3978
Step 27: 3978 + 153 = 4131
Step 28: 4131 + 153 = 4284
Step 29: 4284 + 153 = 4437
Step 30: 4437 + 153 = 4590
Step 31: 4590 + 153 = 4743
Step 32: 4743 + 153 = 4896
Step 33: 4896 + 153 = 5049
Step 34: 5049 + 153 = 5202
Step 35: 5202 + 153 = 5355
Step 36: 5355 + 153 = 5508
Step 37: 5508 + 153 = 5661
Step 38: 5661 + 153 = 5814
Step 39: 5814 + 153 = 5967
Step 40: 5967 + 153 = 6120
Step 41: 6120 + 153 = 6273
Step 42: 6273 + 153 = 6426
Step 43: 6426 + 153 = 6579
Step 44: 6579 + 153 = 6732
Step 45: 6732 + 153 = 6885
Step 46: 6885 + 153 = 7038
Step 47: 7038 + 153 = 7191
Step 48: 7191 + 153 = 7344
Step 49: 7344 + 153 = 7497
Step 50: 7497 + 153 = 7650
Step 51: 7650 + 153 = 7803
Step 52: 7803 + 153 = 7956
Step 53: 7956 + 153 = 8109
Step 54: 8109 + 153 = 8262
Step 55: 8262 + 153 = 8415
Step 56: 8415 + 153 = 8568
Step 57: 8568 + 153 = 8721
Step 58: 8721 + 153 = 8874
Step 59: 8874 + 153 = 9027
Step 60: 9027 + 153 = 9180
Step 61: 9180 + 153 = 9333
Step 62: 9333 + 153 = 9486
Step 63: 9486 + 153 = 9639
Step 64: 9639 + 153 = 9792
Step 65: 9792 + 153 = 9945
Step 66: 9945 + 153 = 10098
Step 67: 10098 + 153 = 10251
Step 68: 10251 + 153 = 10404
Step 69: 10404 + 153 = 10557
Step 70: 10557 + 153 = 10710
Step 71: 10710 + 153 = 10863
Step 72: 10863 + 153 = 11016
Step 73: 11016 + 153 = 11169
Step 74: 11169 + 153 = 11322
Step 75: 11322 + 153 = 11475
Step 76: 11475 + 153 = 11628
Step 77: 11628 + 153 = 11781
Step 78: 11781 + 153 = 11934
Step 79: 11934 + 153 = 12087
Step 80: 12087 + 153 = 12240
Step 81: 12240 + 153 = 12393
Step 82: 12393 + 153 = 12546
Step 83: 12546 + 153 = 12699
Step 84: 12699 + 153 = 12852
Step 85: 12852 + 153 = 13005

So, 153*85 = 13005