Standards

NC.3.MD.5 Find the area of a rectangle with whole-number side lengths by tiling without gaps or overlaps and counting unit squares.

NC.3.MD.7 Relate area to the operations of multiplication and addition.

• 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 area of rectangles with whole-number side lengths in the context of problem solving, and represent whole-number products as rectangular areas in mathematical reasoning.
• Use tiles and/or arrays to illustrate and explain that the area of a rectangle can be found by partitioning it into two smaller rectangles, and that the area of the larger rectangle is the sum of the two smaller rectangles.

NC.3.MD.8 Solve problems involving perimeters of polygons, including finding the perimeter given the side lengths, and finding an unknown side length.

Skills

1. Find the area of a rectangle by tiling without gaps or overlaps.
2. Multiply side lengths to determine the area of rectangles when problem solving.
3. Illustrate and explain that the area of a rectangle can be determined by partitioning.
4. Use the sum of two smaller rectangles to find the area of a larger rectangle.
5. Find the unknown side lengths given the perimeter of the polygon.

Vocabulary

• Tiling
• Area
• Perimeter
• Polygon
• Partitioning
• Square Unit

Resources for Parents

Anchor Charts