6th Grade math teachers use quizzes to help the students reinforce their understanding of key concepts. “Solving for missing dimensions of rectangles given perimeter quiz” is providing the students with a series of questions where they need to use the perimeter formula to find the missing dimension of a rectangle. For example, if a rectangle has a perimeter of 24 units and a length of 8 units, then P=2l+2w becomes 24=2(8)+2w, which simplifies to 24=16+2w, and finally 8=w. Therefore, the width of the rectangle is 8 units.