Alright, let's solve this math problem step by step. First, we have the number 289. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 15. So, we're going to take the number 289 and add it to itself 15 times.
Step 1: 0 + 289 = 289
Step 2: 289 + 289 = 578
Step 3: 578 + 289 = 867
Step 4: 867 + 289 = 1156
Step 5: 1156 + 289 = 1445
Step 6: 1445 + 289 = 1734
Step 7: 1734 + 289 = 2023
Step 8: 2023 + 289 = 2312
Step 9: 2312 + 289 = 2601
Step 10: 2601 + 289 = 2890
Step 11: 2890 + 289 = 3179
Step 12: 3179 + 289 = 3468
Step 13: 3468 + 289 = 3757
Step 14: 3757 + 289 = 4046
Step 15: 4046 + 289 = 4335

So, 289*15 = 4335