OK, let's work through this together. We're starting with 828 and we're going to multiply it by 18, which means we add 828 to itself 18 times.
Step 1: 0 + 828 = 828
Step 2: 828 + 828 = 1656
Step 3: 1656 + 828 = 2484
Step 4: 2484 + 828 = 3312
Step 5: 3312 + 828 = 4140
Step 6: 4140 + 828 = 4968
Step 7: 4968 + 828 = 5796
Step 8: 5796 + 828 = 6624
Step 9: 6624 + 828 = 7452
Step 10: 7452 + 828 = 8280
Step 11: 8280 + 828 = 9108
Step 12: 9108 + 828 = 9936
Step 13: 9936 + 828 = 10764
Step 14: 10764 + 828 = 11592
Step 15: 11592 + 828 = 12420
Step 16: 12420 + 828 = 13248
Step 17: 13248 + 828 = 14076
Step 18: 14076 + 828 = 14904

So, 828*18 = 14904