Let's roll up our sleeves and solve this. We have 344 and we're going to multiply it by 10, essentially adding 344 to itself 10 times.
Step 1: 0 + 344 = 344
Step 2: 344 + 344 = 688
Step 3: 688 + 344 = 1032
Step 4: 1032 + 344 = 1376
Step 5: 1376 + 344 = 1720
Step 6: 1720 + 344 = 2064
Step 7: 2064 + 344 = 2408
Step 8: 2408 + 344 = 2752
Step 9: 2752 + 344 = 3096
Step 10: 3096 + 344 = 3440

So, 344*10 = 3440