Chad has two pieces of wood. one piece is7\12 foot long the second piece is 5\12 foot longer then the first piece. how long is the second one

These fractions both have the same denominators so we can add them without having the equate them first.

The only thing you have to do is add the numerators (7 and 5), and keep the denominators the same.

7     5            12
-- + ---    =    
12    12         12

When you simplify 12/12 it becomes 1.

The second piece of wood is 1 foot long