OK, let's work through this together. We're starting with 411 and we're going to multiply it by 20, which means we add 411 to itself 20 times.
Step 1: 0 + 411 = 411
Step 2: 411 + 411 = 822
Step 3: 822 + 411 = 1233
Step 4: 1233 + 411 = 1644
Step 5: 1644 + 411 = 2055
Step 6: 2055 + 411 = 2466
Step 7: 2466 + 411 = 2877
Step 8: 2877 + 411 = 3288
Step 9: 3288 + 411 = 3699
Step 10: 3699 + 411 = 4110
Step 11: 4110 + 411 = 4521
Step 12: 4521 + 411 = 4932
Step 13: 4932 + 411 = 5343
Step 14: 5343 + 411 = 5754
Step 15: 5754 + 411 = 6165
Step 16: 6165 + 411 = 6576
Step 17: 6576 + 411 = 6987
Step 18: 6987 + 411 = 7398
Step 19: 7398 + 411 = 7809
Step 20: 7809 + 411 = 8220

So, 411*20 = 8220