Let's get this math done. We have 584 and we're going to multiply it by 15. This is the same as taking 584 and adding it to itself 15 times.
Step 1: 0 + 584 = 584
Step 2: 584 + 584 = 1168
Step 3: 1168 + 584 = 1752
Step 4: 1752 + 584 = 2336
Step 5: 2336 + 584 = 2920
Step 6: 2920 + 584 = 3504
Step 7: 3504 + 584 = 4088
Step 8: 4088 + 584 = 4672
Step 9: 4672 + 584 = 5256
Step 10: 5256 + 584 = 5840
Step 11: 5840 + 584 = 6424
Step 12: 6424 + 584 = 7008
Step 13: 7008 + 584 = 7592
Step 14: 7592 + 584 = 8176
Step 15: 8176 + 584 = 8760

So, 584*15 = 8760