Dave has a board that is
3
1
4
feet long. He cut off
1
7
8
feet from the board.
How long is the remaining piece of board? Use the fraction strips to help.

An image shows two one-whole fraction strips and ten one-eighth fraction strips. One of the one-whole fraction strips and seven of the one-eighth fraction strips are crossed out.

A.
1
1
4
feet

B.
1
3
8
feet

C.
1
1
2
feet

D.
1
7
8
feet