Let's roll up our sleeves and solve this. We have 725 and we're going to multiply it by 6, essentially adding 725 to itself 6 times.
Step 1: 0 + 725 = 725
Step 2: 725 + 725 = 1450
Step 3: 1450 + 725 = 2175
Step 4: 2175 + 725 = 2900
Step 5: 2900 + 725 = 3625
Step 6: 3625 + 725 = 4350

So, 725*6 = 4350