Without delay, let's solve this. We've got 394 and we will be multiplying it by 42, that is, adding 394 to itself 42 times.
Step 1: 0 + 394 = 394
Step 2: 394 + 394 = 788
Step 3: 788 + 394 = 1182
Step 4: 1182 + 394 = 1576
Step 5: 1576 + 394 = 1970
Step 6: 1970 + 394 = 2364
Step 7: 2364 + 394 = 2758
Step 8: 2758 + 394 = 3152
Step 9: 3152 + 394 = 3546
Step 10: 3546 + 394 = 3940
Step 11: 3940 + 394 = 4334
Step 12: 4334 + 394 = 4728
Step 13: 4728 + 394 = 5122
Step 14: 5122 + 394 = 5516
Step 15: 5516 + 394 = 5910
Step 16: 5910 + 394 = 6304
Step 17: 6304 + 394 = 6698
Step 18: 6698 + 394 = 7092
Step 19: 7092 + 394 = 7486
Step 20: 7486 + 394 = 7880
Step 21: 7880 + 394 = 8274
Step 22: 8274 + 394 = 8668
Step 23: 8668 + 394 = 9062
Step 24: 9062 + 394 = 9456
Step 25: 9456 + 394 = 9850
Step 26: 9850 + 394 = 10244
Step 27: 10244 + 394 = 10638
Step 28: 10638 + 394 = 11032
Step 29: 11032 + 394 = 11426
Step 30: 11426 + 394 = 11820
Step 31: 11820 + 394 = 12214
Step 32: 12214 + 394 = 12608
Step 33: 12608 + 394 = 13002
Step 34: 13002 + 394 = 13396
Step 35: 13396 + 394 = 13790
Step 36: 13790 + 394 = 14184
Step 37: 14184 + 394 = 14578
Step 38: 14578 + 394 = 14972
Step 39: 14972 + 394 = 15366
Step 40: 15366 + 394 = 15760
Step 41: 15760 + 394 = 16154
Step 42: 16154 + 394 = 16548

So, 394*42 = 16548