Let's get this math done. We have 87 and we're going to multiply it by 23. This is the same as taking 87 and adding it to itself 23 times.
Step 1: 0 + 87 = 87
Step 2: 87 + 87 = 174
Step 3: 174 + 87 = 261
Step 4: 261 + 87 = 348
Step 5: 348 + 87 = 435
Step 6: 435 + 87 = 522
Step 7: 522 + 87 = 609
Step 8: 609 + 87 = 696
Step 9: 696 + 87 = 783
Step 10: 783 + 87 = 870
Step 11: 870 + 87 = 957
Step 12: 957 + 87 = 1044
Step 13: 1044 + 87 = 1131
Step 14: 1131 + 87 = 1218
Step 15: 1218 + 87 = 1305
Step 16: 1305 + 87 = 1392
Step 17: 1392 + 87 = 1479
Step 18: 1479 + 87 = 1566
Step 19: 1566 + 87 = 1653
Step 20: 1653 + 87 = 1740
Step 21: 1740 + 87 = 1827
Step 22: 1827 + 87 = 1914
Step 23: 1914 + 87 = 2001

So, 87*23 = 2001