Let's roll up our sleeves and solve this. We have 751 and we're going to multiply it by 4, essentially adding 751 to itself 4 times.
Step 1: 0 + 751 = 751
Step 2: 751 + 751 = 1502
Step 3: 1502 + 751 = 2253
Step 4: 2253 + 751 = 3004

So, 751*4 = 3004