Sure thing! We've got 109 and we're gonna multiply it by 4. That's the same as adding 109 to itself 4 times.
Step 1: 0 + 109 = 109
Step 2: 109 + 109 = 218
Step 3: 218 + 109 = 327
Step 4: 327 + 109 = 436

So, 109*4 = 436