Sure thing! We've got 789 and we're gonna multiply it by 7. That's the same as adding 789 to itself 7 times.
Step 1: 0 + 789 = 789
Step 2: 789 + 789 = 1578
Step 3: 1578 + 789 = 2367
Step 4: 2367 + 789 = 3156
Step 5: 3156 + 789 = 3945
Step 6: 3945 + 789 = 4734
Step 7: 4734 + 789 = 5523

So, 789*7 = 5523