A building project calls for 1 1/2 foot boards. How many can be cut from a 12 foot long board.

Answer: 13

Step-by-step explanation:

Well actually

13

and a half, but we are assuming he needs full pieces, so

13

shelves.

This is simple division:

Mr. Gengel needs shelves that are

1

1

3

feet long and has an

18

foot long board. In order to determine how many shelves he can make you must divide:

18

:

1

1

3

=

13.5

You can't have half a shelf so you round down to

1