OK, let's work through this together. We're starting with 893 and we're going to multiply it by 18, which means we add 893 to itself 18 times.
Step 1: 0 + 893 = 893
Step 2: 893 + 893 = 1786
Step 3: 1786 + 893 = 2679
Step 4: 2679 + 893 = 3572
Step 5: 3572 + 893 = 4465
Step 6: 4465 + 893 = 5358
Step 7: 5358 + 893 = 6251
Step 8: 6251 + 893 = 7144
Step 9: 7144 + 893 = 8037
Step 10: 8037 + 893 = 8930
Step 11: 8930 + 893 = 9823
Step 12: 9823 + 893 = 10716
Step 13: 10716 + 893 = 11609
Step 14: 11609 + 893 = 12502
Step 15: 12502 + 893 = 13395
Step 16: 13395 + 893 = 14288
Step 17: 14288 + 893 = 15181
Step 18: 15181 + 893 = 16074

So, 893*18 = 16074