Lesson Plan: Area of Composite Rectilinear Shapes Mathematics • 4th Grade
This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to write expressions for the areas of shapes composed of rectangles and squares and evaluate them to find the area of the shape.
Students will be able to
- add areas of rectangles and squares to find the area of a composite shape,
- subtract areas of rectangles and squares to find the area of a composite shape,
- divide a composite shape into rectangles and squares in different ways and understand that all the ways will give the same answer,
- solve problems including simple unit conversion between metric units of length.
Students should already be familiar with
- the formulae area = base height and area = length width,
- converting from meters to centimeters with whole numbers up to a maximum of 10 m,
- converting from centimeters to millimeters with whole numbers up to a maximum of 10 cm,
- multiplying 2-digit whole numbers by 1-digit numbers.
Students will not cover
- area of nonrectilinear shapes,
- algebraic expressions.