OK, let's work through this together. We're starting with 338 and we're going to multiply it by 41, which means we add 338 to itself 41 times.
Step 1: 0 + 338 = 338
Step 2: 338 + 338 = 676
Step 3: 676 + 338 = 1014
Step 4: 1014 + 338 = 1352
Step 5: 1352 + 338 = 1690
Step 6: 1690 + 338 = 2028
Step 7: 2028 + 338 = 2366
Step 8: 2366 + 338 = 2704
Step 9: 2704 + 338 = 3042
Step 10: 3042 + 338 = 3380
Step 11: 3380 + 338 = 3718
Step 12: 3718 + 338 = 4056
Step 13: 4056 + 338 = 4394
Step 14: 4394 + 338 = 4732
Step 15: 4732 + 338 = 5070
Step 16: 5070 + 338 = 5408
Step 17: 5408 + 338 = 5746
Step 18: 5746 + 338 = 6084
Step 19: 6084 + 338 = 6422
Step 20: 6422 + 338 = 6760
Step 21: 6760 + 338 = 7098
Step 22: 7098 + 338 = 7436
Step 23: 7436 + 338 = 7774
Step 24: 7774 + 338 = 8112
Step 25: 8112 + 338 = 8450
Step 26: 8450 + 338 = 8788
Step 27: 8788 + 338 = 9126
Step 28: 9126 + 338 = 9464
Step 29: 9464 + 338 = 9802
Step 30: 9802 + 338 = 10140
Step 31: 10140 + 338 = 10478
Step 32: 10478 + 338 = 10816
Step 33: 10816 + 338 = 11154
Step 34: 11154 + 338 = 11492
Step 35: 11492 + 338 = 11830
Step 36: 11830 + 338 = 12168
Step 37: 12168 + 338 = 12506
Step 38: 12506 + 338 = 12844
Step 39: 12844 + 338 = 13182
Step 40: 13182 + 338 = 13520
Step 41: 13520 + 338 = 13858

So, 338*41 = 13858