OK, let's work through this together. We're starting with 536 and we're going to multiply it by 23, which means we add 536 to itself 23 times.
Step 1: 0 + 536 = 536
Step 2: 536 + 536 = 1072
Step 3: 1072 + 536 = 1608
Step 4: 1608 + 536 = 2144
Step 5: 2144 + 536 = 2680
Step 6: 2680 + 536 = 3216
Step 7: 3216 + 536 = 3752
Step 8: 3752 + 536 = 4288
Step 9: 4288 + 536 = 4824
Step 10: 4824 + 536 = 5360
Step 11: 5360 + 536 = 5896
Step 12: 5896 + 536 = 6432
Step 13: 6432 + 536 = 6968
Step 14: 6968 + 536 = 7504
Step 15: 7504 + 536 = 8040
Step 16: 8040 + 536 = 8576
Step 17: 8576 + 536 = 9112
Step 18: 9112 + 536 = 9648
Step 19: 9648 + 536 = 10184
Step 20: 10184 + 536 = 10720
Step 21: 10720 + 536 = 11256
Step 22: 11256 + 536 = 11792
Step 23: 11792 + 536 = 12328

So, 536*23 = 12328