Sure thing, let's get straight to it. We start with 338 and we're going to multiply it by 20, which means adding 338 to itself 20 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

So, 338*20 = 6760