Alright, let's solve this math problem step by step. First, we have the number 57. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 20. So, we're going to take the number 57 and add it to itself 20 times.
Step 1: 0 + 57 = 57
Step 2: 57 + 57 = 114
Step 3: 114 + 57 = 171
Step 4: 171 + 57 = 228
Step 5: 228 + 57 = 285
Step 6: 285 + 57 = 342
Step 7: 342 + 57 = 399
Step 8: 399 + 57 = 456
Step 9: 456 + 57 = 513
Step 10: 513 + 57 = 570
Step 11: 570 + 57 = 627
Step 12: 627 + 57 = 684
Step 13: 684 + 57 = 741
Step 14: 741 + 57 = 798
Step 15: 798 + 57 = 855
Step 16: 855 + 57 = 912
Step 17: 912 + 57 = 969
Step 18: 969 + 57 = 1026
Step 19: 1026 + 57 = 1083
Step 20: 1083 + 57 = 1140

So, 57*20 = 1140