best way to payoff mortgage

[Kelli Aberle]

What is the best way to payoff a mortgage. I am reading that you can either add extra each month or make one additional payment each year. I think I read that making one extra payment in a year is somehow better than extra money each month and causes the loan to be paid down faster. I currently own 4 properties. 2 are free and clear. 2 have mortgages that I would like to have paid off in 5 years. I am closing on 2 additional properties as we speak (which will also have loans). We are long term investors looking for passive income. Thanks.