Let's roll up our sleeves and solve this. We have 23 and we're going to multiply it by 16, essentially adding 23 to itself 16 times.
Step 1: 0 + 23 = 23
Step 2: 23 + 23 = 46
Step 3: 46 + 23 = 69
Step 4: 69 + 23 = 92
Step 5: 92 + 23 = 115
Step 6: 115 + 23 = 138
Step 7: 138 + 23 = 161
Step 8: 161 + 23 = 184
Step 9: 184 + 23 = 207
Step 10: 207 + 23 = 230
Step 11: 230 + 23 = 253
Step 12: 253 + 23 = 276
Step 13: 276 + 23 = 299
Step 14: 299 + 23 = 322
Step 15: 322 + 23 = 345
Step 16: 345 + 23 = 368

So, 23*16 = 368