Let's get this math done. We have 19 and we're going to multiply it by 15. This is the same as taking 19 and adding it to itself 15 times.
Step 1: 0 + 19 = 19
Step 2: 19 + 19 = 38
Step 3: 38 + 19 = 57
Step 4: 57 + 19 = 76
Step 5: 76 + 19 = 95
Step 6: 95 + 19 = 114
Step 7: 114 + 19 = 133
Step 8: 133 + 19 = 152
Step 9: 152 + 19 = 171
Step 10: 171 + 19 = 190
Step 11: 190 + 19 = 209
Step 12: 209 + 19 = 228
Step 13: 228 + 19 = 247
Step 14: 247 + 19 = 266
Step 15: 266 + 19 = 285

So, 19*15 = 285