- CCSS Gr. 3 Area and Perimeter
- Intro to Area Using Unit Squares
- Area Using Unit Squares
- Area with Unit Square and Diagonals
- Discover the Area of a Rectangle
- Multiplication as Rectangle
- Area as Additive (A)
- Area as Additive (B)
- Area as Additive (C)
- Area and the Distributive Property
- Area and Distributive Property (B)
- Area and Distributive Property (C)
- Area and Perimeter of Quadrilaterals
- Area and Perimeter of a Triangle
- Perimeter Puzzles
- Perimeter Puzzle (B)
- Fencing Problem
- Missing Sides Problems
- Missing Sides Problems (B)
- Discover the Area of a Triangle
- Perimeter - Area Challenges
- Area Challenges
- Area Puzzle
- Area Puzzle (B)
- Maximize the Area Puzzle

# CCSS Gr. 3 Area and Perimeter

- Author:
- Jack D. Gittinger

* Common Core Standards for Grade 3-Geometry*
Reason with shapes and their attributes.

- Understand that shapes in different categories (e.g., rhombuses, rectangles, and others) may share attributes (e.g., having four sides), and that the shared attributes can define a larger category (e.g., quadrilaterals). Recognize rhombuses, rectangles, and squares as examples of quadrilaterals, and draw examples of quadrilaterals that do not belong to any of these subcategories.
- Partition shapes into parts with equal areas. Express the area of each part as a unit fraction of the whole. For example, partition a shape into 4 parts with equal area, and describe the area of each part as 1/4 of the area of the shape.

**Common Core Standards for Grade 3-Geometric Measurement****Geometric measurement: understand concepts of area and relate area to multiplication and to addition.**

- Recognize area as an attribute of plane figures and understand concepts of area measurement.
- Measure areas by counting unit squares (square cm, square m, square in, square ft, and improvised units).
- Relate area to the operations of multiplication and addition.
- Geometric measurement: recognize perimeter as an attribute of plane figures and distinguish between linear and area measures.

**---A square with side length 1 unit, called “a unit square,” is said to have “one square unit” of area, and can be used to measure area.**

**---A plane figure which can be covered without gaps or overlaps by n unit squares is said to have an area of n square units.**

**---Find the area of a rectangle with whole-number side lengths by tiling it, and show that the area is the same as would be found by multiplying the side lengths.**

**---Multiply side lengths to find areas of rectangles with whole-number side lengths in the context of solving real world and mathematical problems, and represent whole-number products as rectangular areas in mathematical reasoning.**

**---Use tiling to show in a concrete case that the area of a rectangle with whole-number side lengths a and b + c is the sum of a × b and a × c. Use area models to represent the distributive property in mathematical reasoning.**

**---Recognize area as additive. Find areas of rectilinear figures by decomposing them into non-overlapping rectangles and adding the areas of the non-overlapping parts, applying this technique to solve real world problems.**