Sure thing, let's get straight to it. We start with 18 and we're going to multiply it by 19, which means adding 18 to itself 19 times.
Step 1: 0 + 18 = 18
Step 2: 18 + 18 = 36
Step 3: 36 + 18 = 54
Step 4: 54 + 18 = 72
Step 5: 72 + 18 = 90
Step 6: 90 + 18 = 108
Step 7: 108 + 18 = 126
Step 8: 126 + 18 = 144
Step 9: 144 + 18 = 162
Step 10: 162 + 18 = 180
Step 11: 180 + 18 = 198
Step 12: 198 + 18 = 216
Step 13: 216 + 18 = 234
Step 14: 234 + 18 = 252
Step 15: 252 + 18 = 270
Step 16: 270 + 18 = 288
Step 17: 288 + 18 = 306
Step 18: 306 + 18 = 324
Step 19: 324 + 18 = 342

So, 18*19 = 342