Sure thing! We've got 688 and we're gonna multiply it by 6. That's the same as adding 688 to itself 6 times.
Step 1: 0 + 688 = 688
Step 2: 688 + 688 = 1376
Step 3: 1376 + 688 = 2064
Step 4: 2064 + 688 = 2752
Step 5: 2752 + 688 = 3440
Step 6: 3440 + 688 = 4128

So, 688*6 = 4128