OK, let's work through this together. We're starting with 919 and we're going to multiply it by 23, which means we add 919 to itself 23 times.
Step 1: 0 + 919 = 919
Step 2: 919 + 919 = 1838
Step 3: 1838 + 919 = 2757
Step 4: 2757 + 919 = 3676
Step 5: 3676 + 919 = 4595
Step 6: 4595 + 919 = 5514
Step 7: 5514 + 919 = 6433
Step 8: 6433 + 919 = 7352
Step 9: 7352 + 919 = 8271
Step 10: 8271 + 919 = 9190
Step 11: 9190 + 919 = 10109
Step 12: 10109 + 919 = 11028
Step 13: 11028 + 919 = 11947
Step 14: 11947 + 919 = 12866
Step 15: 12866 + 919 = 13785
Step 16: 13785 + 919 = 14704
Step 17: 14704 + 919 = 15623
Step 18: 15623 + 919 = 16542
Step 19: 16542 + 919 = 17461
Step 20: 17461 + 919 = 18380
Step 21: 18380 + 919 = 19299
Step 22: 19299 + 919 = 20218
Step 23: 20218 + 919 = 21137

So, 919*23 = 21137