Let's get this math done. We have 135 and we're going to multiply it by 7. This is the same as taking 135 and adding it to itself 7 times.
Step 1: 0 + 135 = 135
Step 2: 135 + 135 = 270
Step 3: 270 + 135 = 405
Step 4: 405 + 135 = 540
Step 5: 540 + 135 = 675
Step 6: 675 + 135 = 810
Step 7: 810 + 135 = 945

So, 135*7 = 945