Let's get this math done. We have 150 and we're going to multiply it by 6. This is the same as taking 150 and adding it to itself 6 times.
Step 1: 0 + 150 = 150
Step 2: 150 + 150 = 300
Step 3: 300 + 150 = 450
Step 4: 450 + 150 = 600
Step 5: 600 + 150 = 750
Step 6: 750 + 150 = 900

So, 150*6 = 900