OK, let's crack this. We're given 689 and our task is to multiply it by 6. Essentially, we'll be adding 689 to itself 6 times.
Step 1: 0 + 689 = 689
Step 2: 689 + 689 = 1378
Step 3: 1378 + 689 = 2067
Step 4: 2067 + 689 = 2756
Step 5: 2756 + 689 = 3445
Step 6: 3445 + 689 = 4134

So, 689*6 = 4134