Let's get this math done. We have 305 and we're going to multiply it by 7. This is the same as taking 305 and adding it to itself 7 times.
Step 1: 0 + 305 = 305
Step 2: 305 + 305 = 610
Step 3: 610 + 305 = 915
Step 4: 915 + 305 = 1220
Step 5: 1220 + 305 = 1525
Step 6: 1525 + 305 = 1830
Step 7: 1830 + 305 = 2135

So, 305*7 = 2135