Sure thing! We've got 423 and we're gonna multiply it by 4. That's the same as adding 423 to itself 4 times.
Step 1: 0 + 423 = 423
Step 2: 423 + 423 = 846
Step 3: 846 + 423 = 1269
Step 4: 1269 + 423 = 1692

So, 423*4 = 1692