Without delay, let's solve this. We've got 600 and we will be multiplying it by 6, that is, adding 600 to itself 6 times.
Step 1: 0 + 600 = 600
Step 2: 600 + 600 = 1200
Step 3: 1200 + 600 = 1800
Step 4: 1800 + 600 = 2400
Step 5: 2400 + 600 = 3000
Step 6: 3000 + 600 = 3600

So, 600*6 = 3600