OK, let's work through this together. We're starting with 343 and we're going to multiply it by 6, which means we add 343 to itself 6 times.
Step 1: 0 + 343 = 343
Step 2: 343 + 343 = 686
Step 3: 686 + 343 = 1029
Step 4: 1029 + 343 = 1372
Step 5: 1372 + 343 = 1715
Step 6: 1715 + 343 = 2058

So, 343*6 = 2058