Alright, let's solve this math problem step by step. First, we have the number 351. 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 351 and add it to itself 18 times.
Step 1: 0 + 351 = 351
Step 2: 351 + 351 = 702
Step 3: 702 + 351 = 1053
Step 4: 1053 + 351 = 1404
Step 5: 1404 + 351 = 1755
Step 6: 1755 + 351 = 2106
Step 7: 2106 + 351 = 2457
Step 8: 2457 + 351 = 2808
Step 9: 2808 + 351 = 3159
Step 10: 3159 + 351 = 3510
Step 11: 3510 + 351 = 3861
Step 12: 3861 + 351 = 4212
Step 13: 4212 + 351 = 4563
Step 14: 4563 + 351 = 4914
Step 15: 4914 + 351 = 5265
Step 16: 5265 + 351 = 5616
Step 17: 5616 + 351 = 5967
Step 18: 5967 + 351 = 6318

So, 351*18 = 6318