Sure thing! We've got 307 and we're gonna multiply it by 4. That's the same as adding 307 to itself 4 times.
Step 1: 0 + 307 = 307
Step 2: 307 + 307 = 614
Step 3: 614 + 307 = 921
Step 4: 921 + 307 = 1228

So, 307*4 = 1228