OK, let's work through this together. We're starting with 240 and we're going to multiply it by 8, which means we add 240 to itself 8 times.
Step 1: 0 + 240 = 240
Step 2: 240 + 240 = 480
Step 3: 480 + 240 = 720
Step 4: 720 + 240 = 960
Step 5: 960 + 240 = 1200
Step 6: 1200 + 240 = 1440
Step 7: 1440 + 240 = 1680
Step 8: 1680 + 240 = 1920

So, 240*8 = 1920