Alright, let's solve this math problem step by step. First, we have the number 369. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 18. So, we're going to take the number 369 and add it to itself 18 times.
Step 1: 0 + 369 = 369
Step 2: 369 + 369 = 738
Step 3: 738 + 369 = 1107
Step 4: 1107 + 369 = 1476
Step 5: 1476 + 369 = 1845
Step 6: 1845 + 369 = 2214
Step 7: 2214 + 369 = 2583
Step 8: 2583 + 369 = 2952
Step 9: 2952 + 369 = 3321
Step 10: 3321 + 369 = 3690
Step 11: 3690 + 369 = 4059
Step 12: 4059 + 369 = 4428
Step 13: 4428 + 369 = 4797
Step 14: 4797 + 369 = 5166
Step 15: 5166 + 369 = 5535
Step 16: 5535 + 369 = 5904
Step 17: 5904 + 369 = 6273
Step 18: 6273 + 369 = 6642

So, 369*18 = 6642