Without delay, let's solve this. We've got 345 and we will be multiplying it by 6, that is, adding 345 to itself 6 times.
Step 1: 0 + 345 = 345
Step 2: 345 + 345 = 690
Step 3: 690 + 345 = 1035
Step 4: 1035 + 345 = 1380
Step 5: 1380 + 345 = 1725
Step 6: 1725 + 345 = 2070

So, 345*6 = 2070