You can use a rule to quickly find the center of a board's width without dealing with small fractions. Lay the rule across the width, keeping the scale's zero mark lined up with one side. Then angle the rule so that an even number lines up with the opposite side. Mark the board at half the distance. You can also find the center by drawing an "X" diagonally across from one set of opposite corners, then across from the other set of opposite corners. The exact center will be where the lines cross.
The loan to value ratio (LTV) is the amount of money you borrow compared with the price or appraised value of the home you are purchasing. Each loan has a specific LTV limit. For example: with a 95% LTV loan on a home priced at $50,000, you could borrow up to $47,500 (95% of $50,000), and would have to pay $2,500 as a down payment. The LTV ratio reflects the amount of equity borrowers have in their homes. The higher the LTV ratio, the less cash homebuyers are required to pay out of their own funds. So, to protect lenders against potential loss in case of default, higher LTV loans (80% or more) usually require a mortgage insurance policy.