Let's roll up our sleeves and solve this. We have 751 and we're going to multiply it by 9, essentially adding 751 to itself 9 times.
Step 1: 0 + 751 = 751
Step 2: 751 + 751 = 1502
Step 3: 1502 + 751 = 2253
Step 4: 2253 + 751 = 3004
Step 5: 3004 + 751 = 3755
Step 6: 3755 + 751 = 4506
Step 7: 4506 + 751 = 5257
Step 8: 5257 + 751 = 6008
Step 9: 6008 + 751 = 6759

So, 751*9 = 6759