Let's get this math done. We have 506 and we're going to multiply it by 20. This is the same as taking 506 and adding it to itself 20 times.
Step 1: 0 + 506 = 506
Step 2: 506 + 506 = 1012
Step 3: 1012 + 506 = 1518
Step 4: 1518 + 506 = 2024
Step 5: 2024 + 506 = 2530
Step 6: 2530 + 506 = 3036
Step 7: 3036 + 506 = 3542
Step 8: 3542 + 506 = 4048
Step 9: 4048 + 506 = 4554
Step 10: 4554 + 506 = 5060
Step 11: 5060 + 506 = 5566
Step 12: 5566 + 506 = 6072
Step 13: 6072 + 506 = 6578
Step 14: 6578 + 506 = 7084
Step 15: 7084 + 506 = 7590
Step 16: 7590 + 506 = 8096
Step 17: 8096 + 506 = 8602
Step 18: 8602 + 506 = 9108
Step 19: 9108 + 506 = 9614
Step 20: 9614 + 506 = 10120

So, 506*20 = 10120