OK, let's work through this together. We're starting with 795 and we're going to multiply it by 27, which means we add 795 to itself 27 times.
Step 1: 0 + 795 = 795
Step 2: 795 + 795 = 1590
Step 3: 1590 + 795 = 2385
Step 4: 2385 + 795 = 3180
Step 5: 3180 + 795 = 3975
Step 6: 3975 + 795 = 4770
Step 7: 4770 + 795 = 5565
Step 8: 5565 + 795 = 6360
Step 9: 6360 + 795 = 7155
Step 10: 7155 + 795 = 7950
Step 11: 7950 + 795 = 8745
Step 12: 8745 + 795 = 9540
Step 13: 9540 + 795 = 10335
Step 14: 10335 + 795 = 11130
Step 15: 11130 + 795 = 11925
Step 16: 11925 + 795 = 12720
Step 17: 12720 + 795 = 13515
Step 18: 13515 + 795 = 14310
Step 19: 14310 + 795 = 15105
Step 20: 15105 + 795 = 15900
Step 21: 15900 + 795 = 16695
Step 22: 16695 + 795 = 17490
Step 23: 17490 + 795 = 18285
Step 24: 18285 + 795 = 19080
Step 25: 19080 + 795 = 19875
Step 26: 19875 + 795 = 20670
Step 27: 20670 + 795 = 21465

So, 795*27 = 21465