Let's roll up our sleeves and solve this. We have 356 and we're going to multiply it by 34, essentially adding 356 to itself 34 times.
Step 1: 0 + 356 = 356
Step 2: 356 + 356 = 712
Step 3: 712 + 356 = 1068
Step 4: 1068 + 356 = 1424
Step 5: 1424 + 356 = 1780
Step 6: 1780 + 356 = 2136
Step 7: 2136 + 356 = 2492
Step 8: 2492 + 356 = 2848
Step 9: 2848 + 356 = 3204
Step 10: 3204 + 356 = 3560
Step 11: 3560 + 356 = 3916
Step 12: 3916 + 356 = 4272
Step 13: 4272 + 356 = 4628
Step 14: 4628 + 356 = 4984
Step 15: 4984 + 356 = 5340
Step 16: 5340 + 356 = 5696
Step 17: 5696 + 356 = 6052
Step 18: 6052 + 356 = 6408
Step 19: 6408 + 356 = 6764
Step 20: 6764 + 356 = 7120
Step 21: 7120 + 356 = 7476
Step 22: 7476 + 356 = 7832
Step 23: 7832 + 356 = 8188
Step 24: 8188 + 356 = 8544
Step 25: 8544 + 356 = 8900
Step 26: 8900 + 356 = 9256
Step 27: 9256 + 356 = 9612
Step 28: 9612 + 356 = 9968
Step 29: 9968 + 356 = 10324
Step 30: 10324 + 356 = 10680
Step 31: 10680 + 356 = 11036
Step 32: 11036 + 356 = 11392
Step 33: 11392 + 356 = 11748
Step 34: 11748 + 356 = 12104

So, 356*34 = 12104