Let's get this math done. We have 192 and we're going to multiply it by 15. This is the same as taking 192 and adding it to itself 15 times.
Step 1: 0 + 192 = 192
Step 2: 192 + 192 = 384
Step 3: 384 + 192 = 576
Step 4: 576 + 192 = 768
Step 5: 768 + 192 = 960
Step 6: 960 + 192 = 1152
Step 7: 1152 + 192 = 1344
Step 8: 1344 + 192 = 1536
Step 9: 1536 + 192 = 1728
Step 10: 1728 + 192 = 1920
Step 11: 1920 + 192 = 2112
Step 12: 2112 + 192 = 2304
Step 13: 2304 + 192 = 2496
Step 14: 2496 + 192 = 2688
Step 15: 2688 + 192 = 2880

So, 192*15 = 2880