DLI 3rd grade guide

3rd Grade Math Scope & Sequence c.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 sumof a x b and a x c . Use area models to represent the distributive property in mathematical reasoning. d. Recognize area as additive. Find areas of rectilinear fgures by decomposing them into non-overlapping rectangles and adding the areas of the non-overlapping parts, applying this technique to solve real-world problems.

End of Unit Competency

By the end of Topic 6 students will be able to fnd the area of a shape and explain how the area connects to multiplication and addition. Language Functions and Features: Describe data and/or steps to solve problems using: ● Mathematical terms ( area, perimeter, square unit, square, Distributive Property, width, length, side ) ● Past tense doing verbs ( counted, broke apart ) to recount steps ● Visuals ( diagrams, designs ) to support approach solution, and/or extract information ● Connectors to order steps ( frst, next, then ) and indicate reasons ( because, so, that means, as a result ) ● Declarative statements to state conclusion ( The area of the design is 21 square inches because… )

SKILLS

VOCABULARY

MANIPULATIVES

● Area as covering ● Relate area to multiplication and addition ● Distributive property ● Area of irregular rectilinear fgures

● area ● unit square ● square unit ● estimate

● Two-color tiles