Let's get this math done. We have 747 and we're going to multiply it by 20. This is the same as taking 747 and adding it to itself 20 times.
Step 1: 0 + 747 = 747
Step 2: 747 + 747 = 1494
Step 3: 1494 + 747 = 2241
Step 4: 2241 + 747 = 2988
Step 5: 2988 + 747 = 3735
Step 6: 3735 + 747 = 4482
Step 7: 4482 + 747 = 5229
Step 8: 5229 + 747 = 5976
Step 9: 5976 + 747 = 6723
Step 10: 6723 + 747 = 7470
Step 11: 7470 + 747 = 8217
Step 12: 8217 + 747 = 8964
Step 13: 8964 + 747 = 9711
Step 14: 9711 + 747 = 10458
Step 15: 10458 + 747 = 11205
Step 16: 11205 + 747 = 11952
Step 17: 11952 + 747 = 12699
Step 18: 12699 + 747 = 13446
Step 19: 13446 + 747 = 14193
Step 20: 14193 + 747 = 14940

So, 747*20 = 14940