OK, let's crack this. We're given 220 and our task is to multiply it by 7. Essentially, we'll be adding 220 to itself 7 times.
Step 1: 0 + 220 = 220
Step 2: 220 + 220 = 440
Step 3: 440 + 220 = 660
Step 4: 660 + 220 = 880
Step 5: 880 + 220 = 1100
Step 6: 1100 + 220 = 1320
Step 7: 1320 + 220 = 1540

So, 220*7 = 1540