OK, let's work through this together. We're starting with 477 and we're going to multiply it by 20, which means we add 477 to itself 20 times.
Step 1: 0 + 477 = 477
Step 2: 477 + 477 = 954
Step 3: 954 + 477 = 1431
Step 4: 1431 + 477 = 1908
Step 5: 1908 + 477 = 2385
Step 6: 2385 + 477 = 2862
Step 7: 2862 + 477 = 3339
Step 8: 3339 + 477 = 3816
Step 9: 3816 + 477 = 4293
Step 10: 4293 + 477 = 4770
Step 11: 4770 + 477 = 5247
Step 12: 5247 + 477 = 5724
Step 13: 5724 + 477 = 6201
Step 14: 6201 + 477 = 6678
Step 15: 6678 + 477 = 7155
Step 16: 7155 + 477 = 7632
Step 17: 7632 + 477 = 8109
Step 18: 8109 + 477 = 8586
Step 19: 8586 + 477 = 9063
Step 20: 9063 + 477 = 9540

So, 477*20 = 9540