Alright, let's solve this math problem step by step. First, we have the number 799. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 27. So, we're going to take the number 799 and add it to itself 27 times.
Step 1: 0 + 799 = 799
Step 2: 799 + 799 = 1598
Step 3: 1598 + 799 = 2397
Step 4: 2397 + 799 = 3196
Step 5: 3196 + 799 = 3995
Step 6: 3995 + 799 = 4794
Step 7: 4794 + 799 = 5593
Step 8: 5593 + 799 = 6392
Step 9: 6392 + 799 = 7191
Step 10: 7191 + 799 = 7990
Step 11: 7990 + 799 = 8789
Step 12: 8789 + 799 = 9588
Step 13: 9588 + 799 = 10387
Step 14: 10387 + 799 = 11186
Step 15: 11186 + 799 = 11985
Step 16: 11985 + 799 = 12784
Step 17: 12784 + 799 = 13583
Step 18: 13583 + 799 = 14382
Step 19: 14382 + 799 = 15181
Step 20: 15181 + 799 = 15980
Step 21: 15980 + 799 = 16779
Step 22: 16779 + 799 = 17578
Step 23: 17578 + 799 = 18377
Step 24: 18377 + 799 = 19176
Step 25: 19176 + 799 = 19975
Step 26: 19975 + 799 = 20774
Step 27: 20774 + 799 = 21573

So, 799*27 = 21573