OK, let's crack this. We're given 336 and our task is to multiply it by 6. Essentially, we'll be adding 336 to itself 6 times.
Step 1: 0 + 336 = 336
Step 2: 336 + 336 = 672
Step 3: 672 + 336 = 1008
Step 4: 1008 + 336 = 1344
Step 5: 1344 + 336 = 1680
Step 6: 1680 + 336 = 2016

So, 336*6 = 2016