Alright, let's solve this math problem step by step. First, we have the number 355. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 57. So, we're going to take the number 355 and add it to itself 57 times.
Step 1: 0 + 355 = 355
Step 2: 355 + 355 = 710
Step 3: 710 + 355 = 1065
Step 4: 1065 + 355 = 1420
Step 5: 1420 + 355 = 1775
Step 6: 1775 + 355 = 2130
Step 7: 2130 + 355 = 2485
Step 8: 2485 + 355 = 2840
Step 9: 2840 + 355 = 3195
Step 10: 3195 + 355 = 3550
Step 11: 3550 + 355 = 3905
Step 12: 3905 + 355 = 4260
Step 13: 4260 + 355 = 4615
Step 14: 4615 + 355 = 4970
Step 15: 4970 + 355 = 5325
Step 16: 5325 + 355 = 5680
Step 17: 5680 + 355 = 6035
Step 18: 6035 + 355 = 6390
Step 19: 6390 + 355 = 6745
Step 20: 6745 + 355 = 7100
Step 21: 7100 + 355 = 7455
Step 22: 7455 + 355 = 7810
Step 23: 7810 + 355 = 8165
Step 24: 8165 + 355 = 8520
Step 25: 8520 + 355 = 8875
Step 26: 8875 + 355 = 9230
Step 27: 9230 + 355 = 9585
Step 28: 9585 + 355 = 9940
Step 29: 9940 + 355 = 10295
Step 30: 10295 + 355 = 10650
Step 31: 10650 + 355 = 11005
Step 32: 11005 + 355 = 11360
Step 33: 11360 + 355 = 11715
Step 34: 11715 + 355 = 12070
Step 35: 12070 + 355 = 12425
Step 36: 12425 + 355 = 12780
Step 37: 12780 + 355 = 13135
Step 38: 13135 + 355 = 13490
Step 39: 13490 + 355 = 13845
Step 40: 13845 + 355 = 14200
Step 41: 14200 + 355 = 14555
Step 42: 14555 + 355 = 14910
Step 43: 14910 + 355 = 15265
Step 44: 15265 + 355 = 15620
Step 45: 15620 + 355 = 15975
Step 46: 15975 + 355 = 16330
Step 47: 16330 + 355 = 16685
Step 48: 16685 + 355 = 17040
Step 49: 17040 + 355 = 17395
Step 50: 17395 + 355 = 17750
Step 51: 17750 + 355 = 18105
Step 52: 18105 + 355 = 18460
Step 53: 18460 + 355 = 18815
Step 54: 18815 + 355 = 19170
Step 55: 19170 + 355 = 19525
Step 56: 19525 + 355 = 19880
Step 57: 19880 + 355 = 20235

So, 355*57 = 20235