Let's roll up our sleeves and solve this. We have 355 and we're going to multiply it by 42, essentially adding 355 to itself 42 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

So, 355*42 = 14910