Menseki Meiro puzzles ("Area Mazes") originally created by Naoki Inaba are not only fun and addictive, they also reinforce critical thinking skills. These puzzles involve a complex web of rectangles. Some areas and side lengths are provided, while others are not. Your task is to find the missing value using your knowledge of area and your powers of critical thinking. These are not your standard apply-the-formula-and-work-backwards area problems -- these mazes force you to think about spatial reasoning in a whole new way. 

Can you solve the puzzle? Can you solve it *without* using any fractions and decimals? Can you prove your answer? Join us as we answer these questions! 

Learners should be fairly comfortable with multiplication/division facts up to 12x12. They should also know how to find the area of a rectangle.