7/12-(1/4). first you need a common denominator which is 12. in the first fraction we already have a 12, so we don't need to multiply times anything, but the second fraction already has a 4, so what times 4 is 12, 3.
a place along a road, border, etc., where travelers are stopped for inspection. 2. a point or item, especially in a procedure, for notation, inspection, or confirmation. Origin of checkpoint. 1935-1940.
Bar, barrier, barricade mean something put in the way of advance. Bar has the general meaning of hindrance or obstruction: a bar across the doorway. Barrier suggests an impediment to progress or a defensive obstruction (natural or artificial): a trade barrier; a mountain barrier; a road barrier. A barricade is especially a pile of articles hastily gathered or a rude earthwork for protection in street fighting: a barricade of wooden boxes.