Sure thing! We've got 275 and we're gonna multiply it by 21. That's the same as adding 275 to itself 21 times.
Step 1: 0 + 275 = 275
Step 2: 275 + 275 = 550
Step 3: 550 + 275 = 825
Step 4: 825 + 275 = 1100
Step 5: 1100 + 275 = 1375
Step 6: 1375 + 275 = 1650
Step 7: 1650 + 275 = 1925
Step 8: 1925 + 275 = 2200
Step 9: 2200 + 275 = 2475
Step 10: 2475 + 275 = 2750
Step 11: 2750 + 275 = 3025
Step 12: 3025 + 275 = 3300
Step 13: 3300 + 275 = 3575
Step 14: 3575 + 275 = 3850
Step 15: 3850 + 275 = 4125
Step 16: 4125 + 275 = 4400
Step 17: 4400 + 275 = 4675
Step 18: 4675 + 275 = 4950
Step 19: 4950 + 275 = 5225
Step 20: 5225 + 275 = 5500
Step 21: 5500 + 275 = 5775

So, 275*21 = 5775