Let's roll up our sleeves and solve this. We have 889 and we're going to multiply it by 23, essentially adding 889 to itself 23 times.
Step 1: 0 + 889 = 889
Step 2: 889 + 889 = 1778
Step 3: 1778 + 889 = 2667
Step 4: 2667 + 889 = 3556
Step 5: 3556 + 889 = 4445
Step 6: 4445 + 889 = 5334
Step 7: 5334 + 889 = 6223
Step 8: 6223 + 889 = 7112
Step 9: 7112 + 889 = 8001
Step 10: 8001 + 889 = 8890
Step 11: 8890 + 889 = 9779
Step 12: 9779 + 889 = 10668
Step 13: 10668 + 889 = 11557
Step 14: 11557 + 889 = 12446
Step 15: 12446 + 889 = 13335
Step 16: 13335 + 889 = 14224
Step 17: 14224 + 889 = 15113
Step 18: 15113 + 889 = 16002
Step 19: 16002 + 889 = 16891
Step 20: 16891 + 889 = 17780
Step 21: 17780 + 889 = 18669
Step 22: 18669 + 889 = 19558
Step 23: 19558 + 889 = 20447

So, 889*23 = 20447