Sure thing, let's get straight to it. We start with 189 and we're going to multiply it by 15, which means adding 189 to itself 15 times.
Step 1: 0 + 189 = 189
Step 2: 189 + 189 = 378
Step 3: 378 + 189 = 567
Step 4: 567 + 189 = 756
Step 5: 756 + 189 = 945
Step 6: 945 + 189 = 1134
Step 7: 1134 + 189 = 1323
Step 8: 1323 + 189 = 1512
Step 9: 1512 + 189 = 1701
Step 10: 1701 + 189 = 1890
Step 11: 1890 + 189 = 2079
Step 12: 2079 + 189 = 2268
Step 13: 2268 + 189 = 2457
Step 14: 2457 + 189 = 2646
Step 15: 2646 + 189 = 2835

So, 189*15 = 2835