198-202
3-FF.10 Find the area of rectangles and squares
3-FF.13 Find the area of rectangles: word problems
3-FF.14 Find the area of complex figures
3-FF.18 Relationship between area and perimeter I
3-FF.19 Relationship between area and perimeter II
Khan Academy: Mappers
3-U.6 Use bar graphs to solve problems
3-U.10 Create line plots with fractions